Learning VLANs. Some resources.

http://www.techtutorials.info/vlan.html
http://www.2000trainers.com/cisco-ccna-03/ccna-trunking-vlan-identification/
http://www.cramsession.com/articles/get-article.asp?aid=19
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2100/c2100ug/csfcncpt.htm
http://cramsession.brainbuzz.com/articles/get-article.asp?aid=20
http://www.ciscopress.com/articles/article.asp?p=170742&seqNum=2
http://www.intelligentedu.com/sign-up/free_cisco_training_materials.html

The below RFC will help you a lot:

ftp://ftp.rfc-editor.org/in-notes/rfc4554.txt
ftp://ftp.rfc-editor.org/in-notes/rfc3069.txt

There are two protocols for creating VLANS are 802.1Q and ISL:

http://en.wikipedia.org/wiki/IEEE_802.1Q  (Open Standard)
http://en.wikipedia.org/wiki/Cisco_Inter-Switch_Link (Cisco Propriety)

There are a few videos also for your help:

www.mcmcse.com/cisco/guides/vtp.shtml
http://www.petri.co.il/forums/showthread.php?t=20074