I need deep front slant pockets. Minimum 8" from the lowest point of the pocket entry to the bottom of the pocket. How deep are these?

Not even close. The top corner diagonally to the opposite corner is barely 7 in. The pocket itself is less than 5 inches tall. Also, the zipper is strictly for show, no pocket there.

Where can I find a loose or baggy fitting pair of pants for men?

Search Amazon for : 511, Propper and Rothco they all carry tactical and BDU pants that are full cut and designed for non-restricted movement. Additionally these brands are extremely high quality and durable meeting military and law enforcement standards.

Where do i buy belts for theses pants i bought?

Thomas Bates Canvas Web Belt Cargo Cotton Military Buckle Made in USA on amazon

What length on the size 42

I'm not sure, as I bought a size 44 and they were more than sufficiently long. There was extra length that settles on your shoes just as they look in the pics.