Open Question: I am considering a 50/50 partnership, but I am investing all the money and have all of the experience.?

I'm starting a company with a friend who I live with. I am investing the money, in his defense he signed a contract to repay his half. I have a lot more knowledge about the industry than he does and again, I am investing my money not his. I don't want to ruin the friendship, nor do I want to lose money. How can I insure his loyatly to the company and commitment to repay my investment, as well as making him a partner in half the profit. Or can I make myself 100% owner and he gets 50% of the profits, but it terms of control I have the final say.