Go to menu/settings/about phone. Scroll down to "baseband" and let us know weather you have a ZV4, ZV5, or ZV9.
If you have a ZV4 or ZV5 then you can use the Gingerbreak.apk to root.
Then you will need to go to the PlayStore and update the Superuser app.
Go to the "All Things Root Guide" sticky. Go to the first guide under "Guides" section to accomplish all the above aforementioned.
When done go to the guide: "How to Install a flash_image; flash a recovery, ROM, and Theme".
You want to install the Zen Garden recovery and the latest MiRaGe ROM.
When done go to the guide: "Link2SD: A Tutorial-New and Updated".
Feel free to ask questions prior to doing anything. Read, Read again, then ask questions.