It's not hard to do it's just hard to come up with something great. Mostly flavors from "the perfumers/ flavors apprentice" you can get 4oz bottles by signing up for a bulk account they're cheap too like $4.50 - $9 a bottle. For nicotine the best place to order is nude nicotine. For flavors check out bullcityvapor. For vg /pg bulk apothecary.
Something real easy and good is 7% tfa strawberry, 3% tfa dragonfruit, 5% loranns Banana cream.
