No, it will not turn brown. When you put the trim in the blender it was probably pretty much pulverized. Your hash will have a lot of plant material in it, especially since it was not run through any kind of screen or sieve. Hence the green color.
No, you will not get 1 oz of hash from 10 ozs of trim. I ran several ounces of trim a few days ago making bubble and ended up with 10 grams dried hash. Yours will weight heavier than normal because there is a lot of plant material in it, rather than just trichs. And it is not dry yet (I would not roll it into a ball until it was mostly dry or it can mold).
Although I make cannabutter sometimes, edibles are not my favorite way to imbide. I love hash and it is my favorite thing to do with trim. You may want to check out some inexpensive bubble bags.