Every one of your listings should have:TowelsSoapToiletriesSilverware & PlatesCleaning SuppliesClean LinensFurniture...Canceling ReservationsThis is a HUGE mistake that will potentially get your account deactivated.

Another of my issues is trying to be perfect and not wanting to make mistakes.

We have never run an analysis like this, so I am sure I may be making mistakes. 

Any common mistakes I could avoid would be greatly appreciated!

I very much plan to build a rental portfolio, but my mission for now is to delve into wholesaling.I made the “mistake” of buying a course on wholesaling, which actually did give me some good information.

My mistake was registering for the auction.

What happens if the seller isn't truthful, or makes a mistake about the information it conveys to buyers?   

This is the biggest mistake made by new investors. 

I won't say it's impossible to do multifamily/passive-income in CA, I just doubt "I" can.I've got no real estate experience, lifetime renter, so I've got a lot of learning to do and I'm looking for a market with enough cash flow/cheap enough that I can afford to make some mistakes.

Most people make the mistake of thinking that properties will simply go up in value over time.