Your realtor can give you all the actual sales comps to help you see the difference between the listing price and the actual sales price.I however do have a little contrarian advice. 

If you want help I can certainly connect you to some good lenders to talk some options with you.

For business valuation there are a number of websites in Australia that can help.

I am happy to help, do you strictly do deals in PA? 

I have built a portfolio using owner occupied loans and I also help other investors do the same.

All good reading and listening, education is best and if you want to learn you have to ingest as much information as possible.I read many books that helped me, but my go-to is listeining to at least 2hrs of podcast with real examples per day.One very important things that "want-to-be" fails is to understand that real estate has many different specialities, so you have to focus your time in your real project.

I will definitely need help with this one, because it is currently landlocked and will need either a road and crossing over the river, or it will need deeded property access through a 3rd party.

Your help is appreciated!

BiggerPockets is full of resources designed to help you along your journey, whether you are just getting started or a seasoned investor.

Working with an agent should help me there, correct?