Is Blackjack Beatable with a coupon?

[gotmarc]

I go to An Indian Casino(pechanga) Once a month to play No limit Hold Em. I have the rewards card and every month I get a $10 blackjack coupon. If I place a $10 bet, The coupon turns it into a $20 bet. In essense, when I win I win $30 and when I lose I only lose $10.

This is a pretty good gamble, but I don't know anything about blackjack strategy. Where can I find the basics? I'm not trying to count cards, I just want to make the best EV decisions once a month.