how do you mean, line up with each other? like how they are set in the tileset, or how they can be put to look good?
I have a village with like 5 houses, but i don't really know how much is too much, my computer didn't start laggin until i made the world map stuff, then it got really bad for my computer so, yeah.
oh! and what version are you using, i mean, if i have XP and you have 2K3 its kinda hard to give advice