Some people prefer to cover first and then glue, but I would much rather glue first and then cover. It is only slightly more difficult, but the end results look much better as the covering hides the seams.

I did some covering articles a while back that you should take a look at.

This one covers the basics:

http://www.rcuniverse.com/magazine/a...?article_id=67

And this one has some videos of the process:

http://www.rcuniverse.com/magazine/a...article_id=726