0) Hi, welcome to CYStia!
1)No, but you can click in a game category and then set the filter options, pretty much the same.
2)You can advertise personal projects (books you're writing, games you're making). Anything else (try this ###, I need writers for my ###) will be totally ignored.
3) Depends. Some games are 1000+ pages, some are barely 12.
4) The Multiverse Chalkboard, Finals Week, Ground Zero, Vengeance, anything 5 or over in rating.