How do I get the inputs for my deal analysis?

[Griffin Myers]

I'm in the process of hunting for my first investment property - I'm in talks with a realtor who has basically said to let him know what properties interest me and we can do more research from there (ironing out the costs I'm going to be looking at if I were to purchase the property). But, the properties that interest me are the ones that will have a nice cash on cash return. So how do I come up with the numbers that I need to consider as inputs when analyzing a property so that I'm not saying I'm interested in every single duplex that is in my price range and getting the numbers post letting him know the property interests me.