- you need at least whatever your broker's minimum amount is to open an account.
- you need the minimum margin requirement to support opening the trade
- you need some additional capital to buffer adverse market movement
There are no required number of trades per day. You can make 1 trade or 100 trades a day. You can spend 10 minutes in front of the computer or all day long. Big Brother isn't watching you.
Your monthly income has nothing to do with your trading. Now if that was meant to mean how much account capital and how many trades you have to make to make a monthly income of X US dollars after taxes then that's unanswerable because your ability to trade successfully - if you have any -will determine that.
I'd suggest that you avoid any regular trading until you have a Trading Plan that you have tested in real time on a Simulator. That's not proof of concept but it will definitely eliminate all worthless schemes..