Hi Nate!
Yes, you might want to go with simple single-flavor blends to figure out what percentage works for you. Now, just because you use 10% of a LorAnns flavoring, doesn't necessarily mean you'll use 10% of that same type of flavor made by a different supplier (e.g. Capella, FlavourArt, TPA, etc.) But, when you get somewhat familiar with your flavor bases, you can adapt to your personal preference. That's why you might often see recipes with specific flavor providers. But, even then, 7% of Vanilla Custard in one person's recipe might be too much or too little for *YOU*
Take good notes when you mix. It will help you figure out the nuances as you go along. (As mentioned above?) read Hoosier's and Dannyv45's blogs. They give some good insight for new mixers.
Have fun!