Money Management is the most important part of professional sports betting. It is nothing worth to be good at picking out the winners combined with an eye for odds with value. If you stake the wrong way losing rows will come, it is not a question of if, it is a question of when.
Correct money management will protect your money from the losses related to periods with many lost bets. If you ask 100 professional sport bettors about their money management plan I am sure you will get 100 different answers but they will be quite alike.
To keep it short, if you can afford to risk these money, I mean it is not your life's savings. I would recommend to bet $28 per bet, (4% of betting bank) if you don't bet at odds over 2.0. Then as your account grows I would suggest that you keep betting $28 per pet until you have doubled up your bank, after that I suggest that you bet 3% of the bank ($42). After you have doubled up again, you should bet 2% of your bank ($56). You would not need to go much lower than 2% until you betting bank is pretty big.
Read more at my link above.