The size of your bet will be shown in the 'Bet' field. This amount is how much you are betting on the next hand. In blackjack, the value of each card is the same as its rank, except for face cards and aces. Face cards are worth 10.
Aces are worth either one or eleven, whichever is more favorable to the hand.
The goal in blackjack is to hold the hand that is closest in total to 21, without exceeding 21. If you or the dealer is dealt a total of 21 in the first two cards, the hand is a blackjack and beats any hand except another blackjack. If you have the higher hand, you receive double your bet on that hand. If the hands tie, you get your bet back. If the dealer's hand is higher, you lose your bet on that hand.