http://www.pokerolymp.com/articles/s...r#.VRxL_OF1HIM
^ Variance calculator.
If you start with 10BI, and your estimate you WR at 1BB/100 (let's not aim too high, you're only just starting FR,) you're actually a 6:4 favourite to go broke. ...playing to the best of your abilities, you might not even make one horrible decision. It's just the math of things.
Regardless, if you give a hoot about losing a hundred bucks, it's just bad BRM, and you're gonna hit 0 time and time again, if you move up too quickly.
40BI is standard, 100BI is pretty save.