Bought ipod from pawn shop

Oh man, doesn't sound good. I wouldn't buy computer from pawn shop. Anyway, if you replace the hard drive you should be OK.

To unlock, go to this link: How to unlock your iPhone for use with another carrier

I would order the OEM remote for the set, they are available online.

sure. you can listen to it. as soon as you hook it up to your computer, with your itunes account, its going to erase the music on there and put in your playlist. so if you like it, dont hook it up to a computer to charger, use a wall plug.

Yes,

1. Turn off the iPod

2. Plug the iPod USB cable into the botom of the iPod "ONLY"

3. Simultaneously, hold the home button and plug the USB cable into the computer

4. KEEP holding the home button until it asks you to connect to iTunes

5. Open iTunes (if not already open) and restore the iPod..

6. Wait for the process to complete and enjoy your new iPod! :)

http://support.apple.com/manuals/#nano

Your screwed cause the applications are erased and replaced with all the **** you got on your computer when you first connected the thing.  There are free utilities that will allow you to reverse sync the data (from ipod to computer instead of from computer to ipod), but your supposed to do that first.
Now you got to pay like everyone else and contribute to Steve Job's medical bills.  Although, some of the applications were probably free, so you can just re-download them.

the only way to unlock your ipod volume limit is to restore using iTunes on your computer.

go to www.jensen.com and download the manual,is free.

You can get a manual at this link here:

iPod Features Guide
iPod Features Guide Late 2006