I don't know the contract price you are paying but hope this last part resonates. 

You're the fish.They often use a mix of fear, threat and urgency to push a target to act.It can be as simple as a 24 hours sale from your favorite shop that requires you to log in to your account first or your boss asking you to wire money right now or he/she/they will lose an important contract that will cost millions.So cybersecurity is important because without that, you might have an incident that can cost a lot of money, impact your reputation and might affect your credit score.

We offered 30K under asking and got it under contract, after the inspection we were able to renegotiate another 10K off of the property due to repairs needed.

I have meetings with my lawyer to discuss partnership contract and acct for the financial piece.Since this is extremely new, I am building a team of a contractor, broker, loan officer, accountant, Lawyer and investors. 

Digitize physical receipts for easy storage and use a consistent naming convention for easy sorting - 2024.03.25 Home Depot.Maintain proper records, such as contracts, settlement statements, and promissory notes.Additionally, you can track income and expenses consistently using software or spreadsheets.As you scale, if bookkeeping isn't fun, consider hiring a bookkeeper for a couple hundred bucks per month.

There's a few GC contracting coaches out there that likely have a few tips that would apply to how you want to see this ran.

I’m literally under contract to do this in the next 30 days in Scottsdale.

Neither outcome is good for you.I give some approximations of each expense category in The Hands-Off Investor, but the best way to nail down operating costs is to look at the property's historical performance.For example, Contract Services and Utilities. 

Quote from @Ben Whittington: Title says it all - how much do you, private lender, pay for attorney's to prepare your loan documents (contracts, promissory notes, deed of interest, etc.) and where are you located?  

I love the idea of fix & flip right now @Abigail King, especially right now here in Chicago and I am sure it is similar for you in central Illinois -- it's winter so there are way less buyers and if you can get under contract soon you can likely rehab over the winter months and hit the spring market!