Originally Posted by jbeast
I just basically play pockets or face cards and fold everything else.
Given that this is the state of your game, you'd be much better off to focus on learning the game well enough to become a winning player before looking toward generating monthly income.
That said, if we do get ahead of ourselves and look ahead, it's certainly possible to average $900 a month playing 25nl. But you should probably look at hours of play, not just days. It's called grinding the micros for a simple reason; to make the kind of money you're talking about, you have to put in a lot of hours, probably more than you've considered when you only look at wanting to avg $30 per day.
You can change the numbers of course, but let's say that on avg, you 3-table. To avg $30 per day, that's $10 per table per day. $10 is 40BB. Assuming 50 hands per hour and a win rate of 5BB/100, that means you have to play an avg of 8 hours per day.