Kanger Evod style tanks
Would suggest you pick a couple of these up. Having a few on hand will let you swap out between flavors, CBD, salts, freebase. It can also let you have a tank going while you clean up, rebuild another. Yes, you can rebuild these albeit doing so is a p.i.t.a.
Kanger Pro Tank Mini
Again might suggest nabbing up a couple of these for same reasons as Evods.
eGo Twist
Grab the 1,000 mAh batteries to get through a day at least. As is the common theme here, pick up a handful of 'em. Get a couple of the chargers for these too, they run about $3 USD a pop but pay off for the eGo batteries.
Eventually you may find rebuilding these micro-coils is very frustrating. Folks here can guide you along to picking up RDAs, RDTAs, better mods and so on when the time comes, if it does. Vaping is a lot better than smoking.
Apologies the links in the pictures all direct to one vendor in particular. Not a shill for them nor an associate of any kind. Merely saw they sold everything for these pen style kits and was being lazy, following least resistance. I neither endorse nor condemn this vendor. Can see the prices they list and note they seem reasonable. Beyond that please decide for yourself where to buy.
Welcome.