Here are some articles that helped me when I was  
a fledgling collector ^_^:

On general care: 
http://users.animanga.com/kallred/Care&Handling.ht
ml

On framing:
http://users.animanga.com/kallred/FrameIt.html

Both of these are part of Internet Guide to Anime 
Cels' Reccomended Links section:
http://www-scf.usc.edu/~ckawakam/cels/rlink.html

-MeganD.