Idk imo if you want to start play with friends first. You can pick up a starter deck from the XY sets. The fairy one is a pretty good one imo, since Fairy pokemon seem to be pretty great. Then buy an Elite Trainer Box for dice, a box, like 8 booster packs and 4 of each energy. Customize your deck out of those 8 packs and play around with it. If you want to be competitive. You probably need to buy a ton of singles from B/W sets for all the staples.