Trying to become an investor at 23

[Marcos Adrian valdez castillo]

Hello everyone, 

My name is Marcos and I currently live in San diego California. My girlfriend and I have 2 options we are thinking to invest into a duplex so we can move in into one unit and rent out the other and hopefully get an FHA loan or we can try and look around for a single family home for us to rent out and put a 20% downpayment. I am thinking of wholesaling in order to get some money for a downpayment but how can I get a property under contract. I will be driving around a neighborhood that I am currently interested in any tips?