200 as a future goal or starting out ?
I only speak for myself, and as a non reader, but you can learn and remember the lines and fills to most pop songs in minutes, but the structure for a song thats not already deeply routed already in your brain takes time to be so.
200 would be an epic fail on all levels
Would it not be better to start with 30, and if the band can get these down, and play with complete confidence, with no sheets, then you can slowly add and add ?