If you want an income a week then you need to work it out backwards.

Say you want $500 per week. I'll use my figures to show what betsize and bank I would need.

If I want to make 500 and I have 300 bets a week and I make a POT of 0.2%. First divide 500 by 0.002 = 250,000. I need to turnover $250,000 to make my profit so on 300 bets this would be 250,000 / 300 = $833.33 bet size.

So if I was only going to risk 2% on any selection then I would need a bank of 833.33/0.02 = $41,666.