How can you tell if your getting a good deal?

[Chris C]

i have been looking at getting into the real estate investing with buying rental properties and everywhere i look seems like a good deal but i would like to know if there are any certain ways you determine if what your getting is actually a good deal or going to be a bust? what i have looked at i just see what the houses in the neighborhood appraise at then how much repairs are needed on the house and put the numbers together to come up with an offer im sure im leaving something out but dont know