Analyzing to determine REI strategy

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I’m new to REI and have not made my first purchase. I live in Las Vegas where cap rates seem to be between 5-7 for single family. I originally wanted to buy and hold sf till property doubles in value and then sell. However with a low cap rate it seems impossible to make decent cash flow after paying mortgage and other expenses. My question is how do I determine cap rate for multi family to determine if this is a better strategy for cash flow when multi family units in Vegas are mostly large apartment buildings that aren’t listed on Zillow or realtor.com? Thanks for all the great information already on these forums! Tony M.