Is 20% a good starting point?

[Curtis Hunter]

A guy that i work with and his wife have been investing for 4 years now. Wholesaling for the 1st 3 years and flipping for the last year. He seems to be doing well for himself so I have been asking him a lot of questions kind of like a mentor. Anyway long story short he has offered to have his wife teach me all about wholesaling and basically become a wholesaler for them on the deals they want to pursue I guess. The deal is I make 20% of the wholesale while they make 80% plus whatever they make on the flip. But I don't have to risk any of my own money I just have to learn and get some experience until I could do it on my own. The thing is he said something about signing like a 2 year contract before going out on my own. Does this sound like a good deal or way to learn the business ways of wholesaling?