I'm about ready to list it, but wondering if I NEED to add attic access for a home I spector. 

IMO it is a complete outlier from that list.

Median listing price is $468 which gives you a value of $178k. 

I am wondering how much information you can garner from the listings (I have been using LoopNet) and at what point do you inquire further and what is the next step?

The property is listed on the MLS as a cash only fixer upper and will not qualify for a conventional loan.#2.)

Some of the ways I look for agents it to research sole properties in my intended market and see who those listing agents were. 

Then let me be UNhelpful and give you the actual rules:  https://www.biggerpockets.com/forums/51/topics/1167632-expla...Pretty much everything you listed needs a 1099, but for the labor portion, not the materials such as paint.

Here’s what I did/would do if starting over with flipping:You need these basic skills, Finding money, Finding a house, Calculating an ARV, Negotiating with the seller if you are sourcing your own deals, Estimating rehab costs, Managing the closing process, Building a scope of work, Finding and hiring contractors, Inspecting work and paying contractors, Selling the house (Staging, listing, negotiating with buyers, closing process).1. 

A landlord, the local grocery store and the utility company etc have no business whatsoever knowing a tenants  SSN and if I were you avoid collecting them.

You might be tempted to think you can keep track of everything in your head or just use the transaction listing from your bank account to see everything that’s happening financially in your business.