How much??

if i use a box 3ft tall with 2 plant about how much would my yield be? and im not looking for anything great since this is my first grow.

It's hard to say. You'll just have to wait and find out!!!

1/2 gram per watt of light used is what you want to shoot for. If you can do that , then your a good grower. If its your first grow don't expect a large yield, maybe 2 ounces total dried.