My bets come essentially from statistical analysis, trying to find realistic bets with value.
I always bet myself on all of my picks
In terms of the betting bank: 1/10 = 1% 2/10 = 2%...
Most of my bets are around this level, as I believe that a betting bank must be carefully and cautiously managed. If however, you prefer maximising profit via a Kelly solution, for example then that is your call of course