Omg! I just typed half a flippin' page and hit the wrong button!
Basically the gist of it was....... thank you for thinking of adopting an older kitty.
People are of two minds as to have two males or a male and female.
Ask the shelter how the kitty you want to get gets along with other kitts.
Great site for learning a proper intro...........
http://www.squidoo.com/multi-cat-management
And, litterboxes....... rule of thumb.....one per cat with one extra to boot.
Good luck!!