Much like the stock market, you need to spread your risk around. Scatter your bets across the table, and this will help ensure that you will win something most every roll. Also, spread the money around. Using the System Playing is easy. The game will inform you when you're not making a proper bet.
Craps can be a dangerous game.
Unlike other games of chance, it does matter where you bet your money. The best pass bets to make are Pass and Don't Pass, and Come and Don't Come, with or without Free Odds. In craps there are no guaranteed systems. Often, you start with bets twice the table minimum, 2x, follow with x, then work back up to 2x, or higher, as you win. This is your only protection against inevitable cold streaks.