I'd like to sell an autographed baseball card by trot nixon on ebay. I need help?

I've never sold anything on ebay before, but I REALLLLY could use the cash. It's an autographed card by Trot Nixon from the Red Sox in 2004. It's in a really, really good condition. The thing is, I have no idea how to price it... I was thinking maybe I could price it at $150 to $200 starting bid, and then maybe like $250 or $300 for a buy it now. Please help, I could really use it. I'm a teenager and i have been trying to get a job. I have been unable to though because I'm injured, so please don't make any smart remarks about just getting a job. Thank you to those who didn't even think of that! Thanks for the help I really really appreciate it! :)