Make the Template class first, that will be very important, Modules and Blocks and certain Addons can come later, but your best bet is to make a Template class first, then possibly make an SMTP class for handling the emails, and whats going in and out. Just by making these classes, and then starting on the main work is good, considering then you got everything you need right there, and it should help you a bit. :]

__________________
VillageIdiot can have my babbies ;d