Hey hope its not to late, but that black stuff on the ground is called black out it is a vct tile adhesive, you are not likely going to get it all out, and you don't really need to. I do hardwood flooring and i called the guys at my flooring company who do vct and lino and they said that all you should need to do in order to level the floor is just use a self leveling compound such as planipatch or ultra plan easy and just mix in a primer and it will adhere over top of the blackout. plus the advantage of using a self leveling compound is that you will only have to trowel the edges smooth the patch will level itself.
Richard
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