Sounds like your account is verified so you should be good,  Just make sure you have a reader.  You can pick one up at many retailers.  Make sure you have your tax loaded, if you have any items you can import them.  You don't need wifi just a cell connection, your battery should last all day it doesn't take much unless you have a bad cell or wifi connection.

Go through your account & settings page and make sure everything is setup, Location, receipt