I read your post and wondered whether you were a licensed agent or not, but was confused since you listed yourself as a "Home Buyer" with Trulia. If you are licensed there would be great advantages for you in joining your local board of realtors and signing up with the local MLS, it will have all of this information and more for you to help your investors out.
If you aren't licensed, I would be very careful what you undertake to help the investors. In Minnesota the law reads to assist "for a fee and for another" in a real estate transaction you would need a license. I would check out the website at:
and contact someone there just to make sure that what you are working on doesn't require a license. I would hate to see you wind up in trouble for someone that you weren't aware of. I hope that helps.