Here is how I set up my towns...
Roads:
I will used a general trail that goes around the entire town... It's usually better to do that, so there is some sort of direction. Instead of aimlessly wandering around. I kind of give it a "we all walk this way" kind of feel.
Misc. Buildings:
I usually make the misc. type buildings, a nuetral color. Like if you are in jungle, make them green. Or if in space, make them gray or black. I usually place these in some sort of "random" pattern. Like, on overhead cliffs, and around the city.
Important Buildings:
I usually make the important buildings a bright color, like orange's and yellows. That way you know that they are of significance. Then, I'll place thse along the road, and near the center.
Decorations:
I use a LOT of doodads for towns. Mainly because you can't walk through them, but they add a lot of ambiance. Add to the experience.
Well, here is a very basic town... This is quite a common set-up. But, it never fails.
This is just a generic outline, but, maybe this will give you a few ideas. 
[attachmentid=17315]
NOTE:
When downloading...
Firefox:
Right click-->Save link as
Save the file as "NAME OF MAP"
.scx or .scmIf you do not save the
.scx or .scm, the file will not work.
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that helped alot m8 i will be sure to put credits to you.
Practise.
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OMG LIEK DAT IS S00 MCH HELPZ! SPELZL WRGN DOUH.