Need advice with rental property

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I am new to BP and to real estate. Very happy to have found this group. I'd like to hear your suggestions. I'd like to buy a multifamily to hold and rent. I live in San Diego and would prefer a property around here or not too far from here as I intend to manage it myself. Due to have a low provable income I am qualified to buy a house no higher than 500k putting 300k down. What would be an area in San Diego or nearby that could provide a cash flow? Should I get a duplex or SFR?

Thank you