what you get at pre-release:
6 packs
1 promo
1 special product (sleeve or deck box) for BW its Deckbox
what you need to do at pre-release:
build a 40 card deck (shop will provide basic energies)
play with the deck for 3-4 rounds and get 2 more booster packs
so given that, if you want to keep your cards in good condition, i would bring some sleeves or penny sleeves
to play in. you can always buy penny sleeves for just $1 at the card shop
they will provide a deck box, so you can just put all your extra cards there.
ah, got ninja'd