[ImNew]

First of all, you should make sure that particular bet is +ev for you, bet size should be adjusted according to kelly criterion.

For a good rule of thumb, bet 1% of your roll on a given game. (I bet 1% on games that I can't quantify my edge, sometimes even less)

For example, if team A at +100 at a sportsbook where you think the true price should be -110, kelly will tell you to bet 1.2% of your roll on team A.

So, to sum up, base the bet amount at $10 a game to start with.