If you're talking about equipment needed for diy, it's pretty much standard. Now I'm not a master mixologist or a vendor..but like I said, it's pretty standard:
*Gloves and protective eyewear - Safety First!
*Containers for your mixes (either glass or ldpe bottles)
*Measuring tools (if you're making over 100 mls, I would suggest either graduated cylinders for volume measurement or a small scale if you want to measure by weight. You could go with larger syringes. It'll be accurate but it'll probably take longer).
Nic Base
PG
VG
Flavors
All of that is with the assumption that you either already have a detailed recipe that you have double checked with one of the online calculators. If you haven't gotten familiar with how to use one of the calculators, do that FIRST. Not only will it save you time and frustration of trial and error mixes, but they also have features that allow you to save your recipes so you can have consistent quality...or simply just remind you of exactly what you did last time in case you weren't totally satisfied and want to make changes to your next batch. The cost of all those things vary depending on what vendor you go to. I personally get all my stuff from myfreedomsmokes.com but there are tons of great online vendors like Wizard Labs, Heartland, RTS. Flavor prices will also vary as well between The Flavor Apprentice, Capellas, Flavorwest, Flavourart..etc. It's a bit expensive to "get started" but once you find things you like...you will probably tend to mostly stick to your favorites and experiment on the side. Not to mention, you'll have extra cash from not buying cigarettes (unless you become a mod whore like I did at first..LOL). I know this was REALLY long winded and not real sure I even answered your question, but I hope it helped in some way..LOL Cheers!