If you are thinking about income from trading you should go about it the same way you should any business. Do a breakeven analysis first to see what your cost will be just to not go backwards. For example your cost would include but not limited to,
Data fees, Market as well as Internet.
Computer repairs, replacement and emergency redundancy systems.
Accounting, Book keeping setting up of a trading company and Tax reporting.
Likely amount you will spend on Brokerage per year.
Office expenses.
And the most important,
Wage that you will draw on to live for the first year. If you haven’t got another source of income just in case you don’t make enough money from trading you could be doomed from the start. Nothing will blow your account quicker than having to trade to replace what you have taken out because of living expenses.
If you did this as an full time job you would think you would need to make about $30,000 to $40,000 in your first year just to break-even.
So now to answer your question as how much you would need in your account that simple.
expected return say 30%
Need at least $30,000 to live
Then you would need to have at least $90,000.