how do i know what my cash flow is goin to be?Can U analyze this?

[Account Closed]

i know loopnet isnt going to have any good deals, im just using it to practice analyzing properties.

Once i find out the Income and expenses, i get the NOI by using the 50% rule.

Next i get the cap rate right? So this property that im looking at, has a NOI of 320k. I now need to divide 320k by my mortgage. But i dont have a mortgage and i dont know how i am going to fund the deal. So how would i figure out my cap rate?