@Kyandrea Fowlkes Congrats on getting started and receiving feedback from your letters! First, I will say that I am no lawyer and this is not legal advice, just my opinion. Have you started an LLC or are you looking into one? You may consider one as you start business to make sure that you are protected. However you decide to create your LLC (through a lawyer, Legal Zoom or directly through the state) you may consider having an experienced real estate attorney review to make sure that it is structured properly. Your real estate attorney should be able to draft you a contract that includes what you need to make a sale and make sure that wording abides by the state laws/mandates. BP also has a page under the Tools link, where BP members have shared contracts. You may have your lawyer review one of these if you choose that instead.
Lastly, comps can be found a number of ways. If you are working with a realtor who is investor friendly you could ask them for comps for the area that you are purchasing in as this should provide comps straight from the MLS giving you data on recent sales. Some people say that Zillow works well in their area or Redfin. Another site that claims to provide past sales prices as well as an 'average' comp for a property is FindCompsNow.com. Again, the most reliable way to find comps is probaby with the realtor but the other sources may work okay depending on your area.
Wishing you well in your investing!