My advice is to DIY your juice from day one! DIY lets you have control over the flavour, flavour strength, nicotine strength, and amount of e-juice per batch. This e-juice calculator is invaluable for figuring out how many drops you'll need for whatever proportions you desire:
todmuller.com/ejuice/ejuice.php
As to where to get flavours...I strongly recommend
Perfumer's Apprentice (
perfumersapprentice.com). They're in California, and they are
amazing!
The only experience I had with pre-mixed, ready-to-vape juices was very poor; the flavours were weak to non-existent...vapour production was terrible. Now obviously there are some great suppliers out there who make wonderful pre-mixed juices (as many people here will attest). But even if my experience had been good, pre-mixed juices are far more
expensive than DIY when it comes to trying new flavours & experimenting. Like if you buy a big bottle of some pre-mixed flavour that you've never tried before & don't like it, for whatever reason...you're pretty much screwed. With DIY you can mix a 1mL batch for next to nothing, choosing your own recipe too - much more affordable (and fun!).
I'm in Canada so I'm not informed enough to recommend a source that's relatively local to Florida for your flavourless PG with nicotine, or dram bottles (good for mixing in), etc etc...but yeah, if you do decide to DIY you will definitely not regret ordering some concentrated flavours from
Perfumer's Apprentice. Happy vaping!