i forgot my passcode, i transferred my data to the computer, now how do i reset the passcode???

Connect the iOS device to your computer and try to make a backup

iOS: How to back up

Then restore via iTunes. The iPod will be erased. Place the iOS device in Recovery Mode if necessary to allow the restore.

If recovery mode does not work try DFU mode.

How to put iPod touch / iPhone into DFU mode « Karthik's scribblings

For how to restore:

iTunes: Restoring iOS software

To restore from backup see:

iOS: How to back up

If you restore from iCloud backup the apps will be automatically downloaded. If you restore from iTunes backup the apps and music have to be in the iTunes library since synced media like apps and music are not included in the backup of the iOS device that iTunes makes.

You can redownload iTunes purchases by:

Downloading past purchases from the App Store, iBookstore, and iTunes Store

Hold And Press The Power Button On The Top While Holding The Home Button On The iPod When The iPod Screen Goes Black Let Go Of The Power Button But Keepn Holding The Home Button Untill The iTunes Logo Appears Connect Your iPod To You Computer On iTunes You Should See An iPod And A Restore Option Just Click Restore And Follow The Instructions On Screen!