There are some states that require "minimum service", this DOJ website shows which states they are.

This is a description of the website if you haven't heard of it:OverviewListingbook, LLC, based in Greensboro, N.C., provides an online technology platform and patented client management system that allows real estate agents to provide their buyers and sellers the industry's best search experience, including real-time MLS data and public records, the ability to view their customers' search activities and collaborate with them online, and to easily and automatically provide other information and tools to help clients find the perfect home or market their property.Listingbook has 70 MLS clients and is available to 60 percent of agents nationwide.

I would consider building a targeted website for the demographics you are searching for and then working with a web developer to SEO the site as much as possible.I would suspect though that networking will most likely bring you your biggest leads early on.

Do not depend on websites like Zillow or anything like that because they are all over the place.

Try rentometer.com, it's a useful website to check rents.Hope it helps.

I talked to many whose website said they were investor friendly, but in person, they were just negative.

@Lolly Spindler I know a few p2p websites that offer bitcoins.

This website is truly inspiring.

The market place on bp; other real estate investment websites such as connected investors, backpage, your REIA group & fb still has pull contrary to popular belief.

I personally have never used a mailer and just do online marketing with my website because SEO is my specialty (and its free besides purchase of domain/hosting).Also last word is don't get discouraged if this is really what you want to do.