Basic Trixbox Setup

I need help with a trixbox set up. I need to accomplish these: Set up a DID number to ring thru to a GSM phone. Set up a call back system. Set up incoming fax using a DID. Set up working worldwide outbound calling from soft or hard ip phone. The Trixbox set up is on a VPS using a basic installation. I would also expect to be briefed on how to manage and maintain this system.