Oddly, I disagree with all these great guys and they are correct. How can I disagree and they be correct, you ask? Well, they are being conservative.
If you plan to win then you will find that betting any amount will win. However, if you are planning to lose then betting any amount will lose.
Now...the hard part. I realize you plan to win. How do you keep your mind at ease and able to do quality assessment? How do you win long term? You do that by making rules for yourself. Look, if you stay at 4% or below on bankroll on every play and you feel you can win...then do it.
I would say that 3% or 3.5% of your bankroll tops per play is a GREAT WAY TO GO!! You are planning on having a winning percentage, right? Well, then it would take a while for that type of play to bother you....look for swings of 18% plus or minus, by the way. Volatility is our friend, not our enemy.
FURTHER, I would never risk more than 7% in any one day! That means you can play more plays but at lesser bankroll percentage or you can play up to two plays at 3.5% bankroll.
I, personally believe in flat wagering about 3% of my bankroll on every play. I should never exceed 7% in a day and once I lose about 18% or more, I stop for five days. This works...believe me...for me.
We all are different and OldManTed is different than me, I can tell. However, you must find your way and realize that any that have replied are not necessarily wrong, but we all run on different wavelengths.
Good luck. tulsa