There is a litany of options online and I would like to avoid those that slant towards selling more programs, services...etc.

I was doing some research online when I noticed, on many occasion, that Biggerpockets.com would be the link I would use, and with the best information.

My property manager did advertise this property online.

Deal on line. 

If it is not feasible to visit the office and you have to make an online purchase, always verify there is a good return policy:) 

You can seller finance to another investor as a commercial loan, but you're speaking about consumer financing.As I said, read here on BP, there are a few, not many, who know seller financing as it is required to be done today so be careful about what you read on line.

or is this information available on line through the county GIS systems.? 

I found several online but I don't know how to compare them.

Or rental properties, or create an online business, etc."

If you commingle your money that can open liability there as well.Not sure about all states but in Missouri if you file the LLC online yourself it only cost 51.25 & no money to maintain the LLC.