I own 4 doors not but I need to stay more organized.  

Look at purchase HUDS, statement of work if it was a renovation and the sale HUD to make sure they made money on the deal.An organized and easy to navigate borrower's package.Security documents to collateralize the loan against real, tangible property.I also like to throw in some communication clauses with consequences for ghosting.Cheers!

I have kept track of all my expenses in an excel sheet/word document but feel like there may be a more organized and efficient method to tracking?

Has dealing with this organization been a good experience? 

It's organized good, I do inspections, but my fear is the side hustle turns into hoarding.

Even small-scale operations like beekeeping, organic farming, or growing specialty crops (e.g., lavender, hemp, etc.) can generate income.Hunting Leases: If the land has good wildlife, you could lease it to hunters during the appropriate seasons.

“A QOF is an investment vehicle that files either a partnership or corporate federal income tax return and is organized for the purpose of investing in QOZ property.”What are the benefits of buying property in an opportunity zone?

Does anyone recommend knowledge sources on building a mobile home parks (websites, books, organizations, plans, etc..). 

She runs an organization that helps homebuyers in a 7-county area around Peoria and she's an investor as well.

You sound very organized for a first-time flipper so it looks like finding that mentor is paying off.