The question "How do I find comps?" comes up on the forums frequently, and has been answered a number of times, as the links below will show. There is no special order to these, so read one and all to discover the varied methods being used. Feel free to direct your specific questions onto one of those threads if some method being given in such thread doesn't seem sufficiently clear. Enjoy!

http://www.biggerpockets.com/forums/48/topics/9211-what-online-comparable-sales-resources-do-you-like-

http://www.biggerpockets.com/forums/12/topics/64366-best-website-for-home-comparables-

http://www.biggerpockets.com/forums/12/topics/28821-pulling-comps

http://www.biggerpockets.com/house-value-comps.html

http://www.biggerpockets.com/forums/48/topics/3080-finding-comps-for-a-area

http://www.biggerpockets.com/files/user/JasonScott/file/estimating-arv

http://www.biggerpockets.com/forums/93/topics/70098-accurate-comps-without-mls-access

http://www.biggerpockets.com/forums/311/topics/68618-comps-without-the-mls

http://www.biggerpockets.com/forums/48/topics/13226-comps-website

http://www.biggerpockets.com/forums/67/topics/72346-where-do-you-run-your-comps

http://www.biggerpockets.com/forums/69/topics/60001-compiling-arv-data

http://www.biggerpockets.com/forums/93/topics/73180-explaining-to-new-investors-why-comps-from-trulia-and-zillow-are-not-reliable

http://www.biggerpockets.com/forums/93/topics/67608-does-anyone-happen-to-know-of-a-website-that-will-allow-me-to-pull-my-own-comps

http://www.biggerpockets.com/forums/93/topics/76206-checking-comps

http://www.biggerpockets.com/forums/93/topics/15122-good-website-for-comps

http://www.biggerpockets.com/forums/12/topics/39786-sales-comps

http://www.biggerpockets.com/forums/12/topics/22356-what-website-do-you-use-for-comps-and-arv-

http://www.biggerpockets.com/forums/48/topics/628-getting-comps-on-real-estate

http://www.biggerpockets.com/forums/12/topics/19242-comps-and-previous-purchase-prices

http://www.biggerpockets.com/forums/48/topics/9818-methods-of-looking-up-comps

http://www.biggerpockets.com/forums/12/topics/14794-what-do-you-use-for-online-comp-research-

http://www.biggerpockets.com/forums/92/topics/68542-investway----anyone-used-using-this-service-for-comps

http://www.biggerpockets.com/renewsblog/2010/03/17/calculating-fixed-costs-flip-rehab-wholesale-real-estate-deal/

http://www.biggerpockets.com/forums/93/topics/75142-trying-to-find-a-certain-topic-pertaining-to-pulling-comps