Just use your apple accounts for app store.
For iMessage on iPod touch you don't get a number people will contact you using the email you used when you signed up.
assuming you already logged your apple id into your device, simply go to setting-messages and turn on the imessages.
upgrade to ios 5.0.1. Just go into itunes and click update and follow the prompts.
If it is the latest ipod touch, then you can set up a tracker if you lose it, but I am unsure how.
Yes, you need to set up the iPod touch with iTunes before using it.
The iPod touch is set up for WiFi from the factory. If you WiFi is available, your iPod should pick it up. Go to www.apple.com to troubleshoot.
if your ipod is a 4gen, yes
Yes. Set it up in the Settings app.
Yes, HeyTell works from iPod Touch to iPod Touch. If using Medium or High privacy, you can connect using email (if email is set up on the iPod), or you can set privacy to Low, connect using matching contact information, then switching back to Medium or High once you are successfully connected.
no
Yes you can, it is really easy.
Settings>General>Passcode Lock