There are shake and vape one shot flavorings, that might be the quickest way to get an enjoyable mix without steeping. A lot of fruits and berries don't require much steeping, creams, tobaccos and custard type flavors tend to need more steeping. Your mileage can indeed vary, the good news is that you have plenty of base to mix for your experiments.
I would start with smaller, tester batches personally. However, you don't HAVE to do that if you don't want to. Just make sure you keep really good notes, initially, and then along the way as you taste.
Have fun!
Anna
This was one of the flavours I selected (guessing one of the more difficult ones)?
Perfumers Apprentice - French Vanilla II Flavor