In Blackjack, you win if you get a higher hand than the dealer without going over 21. Should you go over 21 (Bust), you lost immediately. Face cards count as 10, Aces are either 1 or 11 and all other cards are face value.
The players and the dealer each get two cards. If your first two cards total, for example, 15, you can "Stand" (take no additional cards) or you can "Hit" (ask for additional cards, one at a time). You indicate your decision to hit or stand by using hand gestures. The dealer will be happy to show you how. After each player in turn has taken all the extra cards he wants, the dealer exposes his "Hole" cards and hits with 16 or less, and stands on 17. Should the dealer go over 21, you win.