Do I have to back up anything from my old phone?
You can take it to a Verizon store and they can do it...but that will only be what is on the phone itself and not the SD memory card. All you have to do with that is put it in the new phone and your good to go.
I would download from the market "MyBackup" (Free) and backup everything. You have a choice of backing up photo's but I never do since mine are stored on my SD card.
How do I restore everything onto my new phone?
When you go to restore on your new phone, restore everything
but the SYSTEM FILES. It will restore your home screen to the way it was on your old phone. You won't be able to backup game data unless your phone is rooted and you backup APK's and DATA.
Is it as simple as signing in to google?
Signing into Google will restore all your apps and your contacts. But to be honest, the restore way to me is better.
Also, what precautions should I take with sending with sending the old one back? How do I wipe my data off? TIA
Wipe everything off your phone
AFTER you have made sure you have everything on your new phone. After that, do the following:
1. Menu
2. Settings
3. SD & Phone Storage
4. Factory Reset (towards the bottom).
After it is done doing it's thing, shut the phone off and send it off.