For attack craft most of them Ive seen have been on the square epic sized or attached right onto the cardboard cutouts provided in the game box. Torpedoes the same way just with the epic strips instead of squares.
For the number its really upto your taste but usually what I see is 5 fighters, 4 bombers or assault boats, 2 thunderhawks, or 1 manta. Depending on what your using of course.