Batteries easy choice Sony vtc5 or vtc4 their inexpensive and have a 30a limit and the vtc5 have 2600mah capacity, I just ordered 2 more from fatdaddyvapes.com Friday and according to usps they are into awaiting delivery tommorow.
Charger intellicore or similar Brand never skimp on batteries and chargers.
As for drippers.... that's a monster to tackle if your just getting into dripping,
Maybe try an igoM, or TOBH clone as you might decide later what kind of build you prefer than you can by an atty that suits. Plume veil looks beastly for any build but pricey unless you Dont mind clones vapingwithtwisted420 has a review if a clone on YouTube
Do you have any idea what random mod you getting? Regulated? If so what's the limits? Or mech? If so what kind cause I'm nosey lol.
Don't forget the basics of building an ohm meter ohms law knowledge and calculator(there's apps for it) if its a mech you will also need a volt meter...