To find a great property it requires two things: accurate ARV and precise ERC.

There is no book available that can give you an accurate figure of this amount/value at this time.

I don't know Jimmy Hong, it sounds like your realtor is probably spot on and pretty close to accurate even though that is just a generic number.

We are just flipping now hoping to gather cash to start buying houses cash , then do "rent to own" deals for customers.

Overall I think the rent amounts are very accurate.

And you get the benefit of having over 70 past ones to catch up on.Locate and attend 3 different local REIA club meetings great place to meet people gather resources and info.

Scott The Book on Flipping Houses,The Book on Estimating ReHab Costshttp://www.biggerpockets.com/flippingbookLocate and attend 3 different local REIA club meetings great place to meet people gather resources and info.

Also, are you sure the $3000 a month rent figure is accurate? 

Since you make your money on the front end, that initial estimate needs to be pretty accurate (with contingencies built in) or you will find yourself in for an expensive lesson.Here is the thing that many new flippers find out . . . they can't get contractors to give them estimates which are needed to make an informed offer. 

Also anyone else who comes through you have a sign in sheet to gather phone numbers and email addresses so you can follow up.