Historical analysis for new betting system

[Ricass]

This is my first post so bare with me! I am researching a new system for sports betting. I am looking at a low risk minimal return stategy (over/under) looking at Amercian sports since they play lots of games everyday. What sort of return on investment % (yield) figure would you think is decent and sustainable for a low risk minimal return strategy? Also, without me doing much leg work... how much historical data should I be getting to to figure out if this is worthwhile pursuing? 100 games, 500, 1000+?

[Datapunter]

Re: Historical analysis for new betting system :welcome ricass What do you mean by "low risk minimal return strategy" ?