I also think you need to find someone that is as dedicated as you are, and if not they make it clear and you will be compensated appropriately... the worst thing is to find yourself working with someone that is not as enthusiastic or committed about the project as you are ... for instance, if you work full-time on the project and your partner decides that he needs to have a job and work part time with you, there would eventually be problems ...

Also try to find someone that can complement you, i.e. if you know your weaknesses then find someone that is strong at those (of course things that matter to your business)