Out of all casino games, the house has the smallest edge on blackjack. The more decks that are used, the larger the house edge. If you look hard enough you can find casinos which offer single deck games. So you want to get some free meals or a hotel room.
Casinos give comps to players depending on how much they gamble and how long they gamble for.
So the first thing you should do is let a pitboss or floorman know who you are and that you would like to be rated. If they say no, don't worry, you'll still have good credit with the casino and you should simply mention that you'll be going to a different casino, which can sometimes get them to offer you something. Betting with bookies are illegal and betting with international sports books are still not defined by the law. Nevada sports books will usually give you better odds than the illegal bookies, however they will not accept wagers from outside the state. International sports books have similar bets and odds as those in Las Vegas.