I come a slight different angle, as I work full time running an e-commerce business. What I would advise, is one of two things. Either develop your site to advertise more related products, I find it good to jot down on paper what you think would sell and then go find the merchant. Or look for popular products that have good comission and set up a site advertising that. I think this will home your skills and help you go part time in current profession or quit so you can conentrate on your training.
I wish you the best of luck.