Cross-X on 15 November 2010
You only just got MGS4??? WAT DA FARKKKKKKKKKKKKKKK!!!!!!!
Lol jks man 
Darth has pretty much summed it up perfectly. However you can download the MGS4 Database from the PSN Store which does give you bios and timeline for the entire MGS series up to MGS4 (Peace Walker isn't included). It's great database with easy to understand stuff if you give time to read them because there's a lot of things for the MGS Universe.
Do download the Database.
