How much can I make when I am on disibility going to goodwill program?

I am wanting to go to work for goodwill in the program with vocational rehabilitation. I need to know how much I can make if it is going to be 8.50 an hour since that is minimum wage i know they have to give you that amount. I would be working from 9 to 3 pm and taking an hour off for lunch we get paid every two weeks i was just wondering how much it would effect my ssi. I am also wondering how to get in contact with the part where they give you nine months to work and see where it works cause believe me i want to work really bad. So i was hoping that you would tell me about the nine month benefits and how much i could make thanks and have a blessed day.

Jennifer