Any appropriate amount of games/sample size before starting to bet on a sport?

[cutchemist42]

Obvious example but I find the first 2-3 weeks in NCAA football a little too wild for me. At the same time, 1 month of baseball is still for me, not the best sample size.

Anyone here wait a certain % of a season before betting so that you see the teams and stats?

[FreeFall]

http://en.wikipedia.org/wiki/Confidence_interval