1
Select bets with only 2 possibility (such as under/over)
2
Find 2 bet agencies that offer a quote that is greater than 2, one for a result and the other one for the different result (ie Agency A pays 2,25 for under, Agency B pays 3,1 for over)
3
Go and bet the same amount of money in the 2 agencies.

Bankroll Management Is a Must

1
Firstly, it should be the amount you're willing to lose  never bet your last money.
2
If you've chosen your strategy and determined the portion of the bankroll for each bet, stick to it. ...
3
If you decide to increase your bets  do it slowly and over longer periods.