52 card decks are always used.
Cards are re-shuffled after each hand.
If you hit you are asking for another card, you can hit as many times as you like.
If cards add up to over 21 then you bust and loose your money even if the dealer busts.
If you select the double button then you get one card and your bet is doubled. Cards are worth face value except face cards which are 0 and aces which are 1.
If the dealer has black jack then you are offered insurance.