Transfering my music from my Ipod mini

The second part is easy. If the songs are in your iTunes library on your computer, you just sync your iPod touch to that library.

The first part requires off-loading song files from an iPod to the computer's drive. That's something iTunes cannot do, except for songs purchased from the iTunes Store. iTunes syncing is generally in one direction only, from the computer's iTunes library to the iPod. However, there are third-party methods and utilities that can transfer from iPod to computer. If you do an Internet search on something like "ipod transfer," you should get some links. (The CNET article seems to be popular.)

Once the song files are on your computer's drive, you can add them to your iTunes library. Going forward, you should keep ALL of your songs in your iTunes library (and then back up that iTunes library in case the computer fails). Keeping the only copy of your songs on an iPod is risky; an iPod can easily become broken or lost.