First flip project-How do I prepare the scope of work?

[Allen Smith]

Just got my offer accepted on my first flip property. Have read J Scott's book on estimating rehab costs and listened to tons of BP podcasts.  I am unsure of how to prepare the scope of work. We are going to be our own GC and find HVAC, roof, plumbing, concrete and electrical. Want to find a contactor to do everything else. Have 3-4 recommendations. This is the area that I am the most unsure of. We can explain our vision of what we want very well, but worried about how to put on paper. Hope this makes sense. I'm sure we will get a lot better after the first. Any tips?