@James Davis welcome to BP! It looks like your getting yourself ready. Southern California is expensive, but it doesn't mean you can't make money. from what I read it looks like you want to do fix and flips. I am personally not familiar with that, the only fixes I've dines is when I've bought REO (off the MLS) I had to do major repairs and renovations but not to resell, i prefer the buy and hold strategy. Here's my two cents
Make sure that you know what your repairs costs are and ARV is going to be after the flip, you wanna make a profit (especially of your doing loans with high interest.
Have an exit strategy, know what the rent comparison in case you can't sell the property and have to rent (and refinance to pay off your hard money lenders and line of credits). You don't want to be a negative cash flow. A 400,000 house with 20% down may have a 2500-3000 monthly payment and holding costs, I am not familiar with the rents in Chula Vista, but out here in the San Gabriel valley it has to be a really nice house to rent for that much.
Check your numbers and have the BP community double check yours, I recently found something that I was on the fence and decided to write about on BP. I got a lot of great feedback about things I had missed, turned out it wasn't a good deal after all.
Best of luck!
Sandy