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when you upgrade, all of your information will be fine, except that you will lose your jailbreak, as well as all cydia apps and tweaks. Your steps will be:
1) do a backup just in case
2) upgrade your device in itunes
3) jailbreak
4) reinstall your cydia apps/tweaks
You can get around having to individually reinstall all of your cydia apps after re-jailbreaking by using a cydia app like pkgbackup.
See Luke's guide to upgrading your device's firmware:
http://www.guidemyjailbreak.com/how-backup-cydia-apps-update/