Is it Cash Flow, Cap Rate, COC, all three or something else?  

Most of these properties are going to take me 6-7 years to actually have positive cash flow.

We have been able to set aside some cash/savings over the past few years of marriage and are ready to invest in real estate.

I would and have cashed out my 401k (not Solo) to invest in Self Storage.

You can offer them cash for keys-give them money to move.

Buy something in class B neighborhood or emerging class C neighborhood with higher cash upfront low leverage to ensure you have enough cashflow in worst case scenario and see how it performs.

Initially, I want to buy a little condo and rent it out, to start cash flowing.

I hav some excess cash that I would like to put in a rental property.

Maybe the best bet is a rental refi on one of the two existing properties to be able to get a new home all cash?

Timeline should be Three months: Save cash.