If you went back a few pages you would've found my post with the alignment grid in it.
Quick silly questions:
How big is each tile in a tileset? 32X32?
How wide can/should a tileset be?
Is there any limit on how tall it can be?
I'm trying to make my own and I just want to make sure I'm not screwing anything up. :)
Go to my post I quoted and that will give you the answer to the width part and no, as far as I know of there is no height limit for tilesets. To make sure ya don't screw up use the compile sheet that's provided in that post and you won't go wrong though the grid is 1pixel off on the vertical allignment so just place the tile 1pixel lower ;)