1.- The draw could be a little more harsh than expected. The juice will be less dense tending to leak if using with a rta.

2.- It all depends on flavors, but in general fruits are shake and vape while dessert and tabaco ones will need at least more than a week.

3.- Yes, you can taste it even with nic, at least that’s what I do.

4.- Well, this is more difficult to answer but as far as I know there are some ingredients in some flavors that are less healthier.

5.- That’s ok, I guess.

1. Nothing to know too major. Generally speaking the higher the ph the more flavor you get but more throat hit you get. The more VG the more cloud production you get but less flavor. Now that's not to say you get bad or super weak flavor. I ALWAYS mix at 80vg 20pg and get plenty of flavory goodness.

2. There are a ton of variables that come into play here. What type you're mixing (fruity, dessert, tobacco and so on) and even then getting closer in, I've seen/heard and been told certain concentrates just need some time to mingle. Chances are you'll get to a point where what you make you'll like enough to shake and vape immediately. But all of it benefits from hanging out a bit.

3. So, some may not agree with me but I think you should never ingest nic. Sure, some people might say in super small quantities it won't hurt but I wouldn't take the chance. What's funny is I DO do this with nic in my juice but I cant ever yell it's okay for anyone to do it. However without the nic, there should be jo reason at all to put some on your finger and give it a gum. I do think however getting the flavor aroma from the inhale helps more than taste, idk might just be me.

4. I dont think you'll ever run into any real dangers at all with the raw materials. You can vape straight vg/ph and be fine. Vg is actually a bit sweet

5. Yes dude, mix as weird and as much as you want. You have to learn the basics somehow. Its commonly suggested to begin with so gleaming flavor recipes to build a base palette.

(I hope I got what you needed. Be advised this is based on my experience and not everyone will agree, naturally. Also shout out to the homie above me. I basically built on what he said. I'm stuck in the comment screen on my phone so I cant get a name, haha)

Edit: homies name is u/vapermita and he/she is below my comment, not above, haha.

Just a few things I'd like to point out.

Agitation is just as if not more important than steeping. Use ELR & mix by weight and leave 10% volume for air, shake vigorously three or four times a day. With consistent agitation you can avoid uneccesarily long steeping, I'm a firm believer that most recipes only require three to five days steeping.

Don't use a heated bath, in fact avoid heat or leaving it in sunlight or a hot car if fresh fruit flavors are present. Candy fruit flavors are a hell of a lot more forgiving, and creams / bakery notes actually like heat but the final product is still best if you just agitate. Also note that heat can reduce the nicotine strength, it breaks it down.

And lastly don't bother making your own recipes, just go straight into clones and recipes with high ratings on ELR and then make subtle changes to make it your own. This can really teach you percentages and will save you alot of money, it's always beneficial to just go with what's tried and true, especially on the beginning.

u/Aiasieth93 Also try posting in the r/DIY_eJuice subreddit. They're also quite helpful.

1. You'll end up with PG>60% in most likelihood. Most commercial juice is 20-30% PG. You could end up with something painful to vape, it all depends how sensitive to PG you are.

2. Not necessarily. Some fruit-only mixes are good off the shake. In general, no fruits require more than 48 hours... creams/custards take a couple weeks, tobaccos (other than straight FLV tobacco mixes) take a month or two, and recipes containing DX and/or V2 flavors require 2;^ ^(# of such flavors) months to taste as little like puke as they ever will.

3. You can drip a drop of a mix onto a knuckle, smell it and/or lick. It won't be terribly accurate (heating to vaping temps could change the resultant flavor, and inhaling vapor will give you separate tastes at different points in the vape, but you'll get a quick rough impression.

4. There's nothing truly hazardous. With the exception of nic, every ingredient used has GRAS classification. However, you want to avoid flavors that contain fructose and/or sucrose, as those are actually bad for you to inhale after being heated to vaping temps. DAAP, OtOH, is completely harmless in the concentration used in vaping, since you'll actually be reducing your DAAP intake from when you smoked.

5. Yes. You are mixing for yourself. If you want to follow recipes, you use the amounts listed. If you want to develop your own recipes that are inspired by others' recipes, feel free. Note that you really risk making something like the brown acid^¥ if you just randomly change percentages without a good reason to do so.

^¥ ^("not exactly good", in case you missed the reference. And Woodstock. Although if you remember Woodstock, I'm not sure you were there.)

Just #5,
Mix whatever you'd like, although looking at the average usage percentages, and what percent popular recipes use the concentrates (as well as what other flavors they use them WITH), on websites like ELR or ATF will help give you a starting point.
One thing is to take notes, mix whatever you'd like but go on ELR and make recipe with what percentage you're using it at. This is crucial for developing the pallet, ideas, reference points for adjustments, and the ability to replicate what you make- versus just mixing willy-nilly with drops

Also remember that most of the time when mixing, LESS IS MORE. Using too much aroma in your juice may infact mute the flavor/s. If you want to tailor some recipes to your taste don't start by making huge adjustments. Also, developing some bases, for example a constant fruit mix or a cream base, can help too. Good luck buddy!