Tell them something about why your offer is the best offer out there. Let them know what they are going to get out of this offer and maybe offer a few bullet points to tell them how awesome they will be now that they have this offer.
This offer will do amazing things
This offer will do even better things than before
This offer will be so amazing you'll be amazed it's free
Offer up more text to maybe point them into another offer they might like. If you need help getting set up, we have a full service development team available to offer help and supportas needed