The best way to get started is...

[Nato]

I live in Houston and that is exactly what I am going to be doing. Thanks for the info.

[Nato]

How accurate is netronline.com for comps?

[rgchamb]

I would get a Realtor to give you comps.  You may either know one, or know someone who knows one.  Anyway, in return, you can take them out to lunch, use them when you want to sell properties, or refer anyone to them who wishes to sell a property.