@Jasraj Singh
First going through inspections I look at the conditions of the big ticket items: roof, plumbing, heating and air, electrical, things like; and then the cosmetics. I try to determine if its a big fixer or a cosmetic fixer to be able to get it rented. This will also help you negotiate the price or offer. Consider the age of the house when looking for properties, this will tell you a lot.
As far as the numbers, I look to see if they make sense with the current rents that they bring in. Since I'm newer I like to over estimate my expenses (PM Fee, Taxes, Debt Service, Utilities, Capex, Repairs, etc.) and underestimate my income. Also consider the debt coverage ratio the cash flow provides. Each property will have different expenses depending on if your required to pay for some utilities or not. You will absolutely need reserves, don't skip this part when you're running your numbers. Check a few different sites and talk to property managers about the market rent potential and what you would need to do to get them there.
At first I just looked to see what the cash flow would be with properties, now I also look at the Cash on Cash return as well. Your parameters will vary based on what your goal is. Mine right now is just to build a portfolio and pay down the debt and get the tax benefits.