@Jonathan Cisneros First off I will say South California market is going to be a hard market to wholesale in, but regardless I would recommend one of the follow three options:
1) Do what @Scott Rogers said and partner/work for free for a successful wholesaler in your market. You will learn more from that than any course can teach you
2) Driving for dollars. This is the cheapest but requires most time. Basically drive up and coming neighborhoods and look for run down/abandoned homes. When you get back home look who owns these properties on tax assessors website and then cold call them
3) Cold texting. If you know your market pretty well and have some solid buyers you already have some sort of relationship this will get you to your first deal fastest. Basically, you purchase data or scrape it yourself on properties in specific neighborhoods that haven't sold in a long time. Take this list and skip trace and then use a legal cold text message platform to bulk send people text messages asking if they are interested in selling.