Assigning Contracts

Ok I am trying to get some fast cash so i can invest in commercial real estae…(so far everyone ive talked to says I need at least 20% down) to get started in commercial real estate. so my plane is to look into assighning contracts…where do i start and how does it work?

Can I find a property thats priced at 75k and needs rehab sign contract with option out and in the alloted out time assighn the contract to another for a small fee?