How to bet
Some players just bet the same amount every hand, some bet more after a win, or after a loss. Some players use the Martingale system, where they keep doubling up after every loss untill they hit a win, or bust out!!
The point here is that it wont really make any difference in the long run, what sort of betting system you use, it all ends up the same. So pick one that you feel comfortable with, and one that adds a little fun to the game. For new players Flat betting the same amount each hand is the best option.
How much should I bet
If your just starting out, bet small, and build up your bank. If you play with bonuses, you should see the bank grow, quite nicely, during the first few months. Then you can bet larger amounts if you wish. But of course its up to you. Never bet more than you can afford to lose, never chase losses, and the golden rule, STICK to the basic strategy.