I've seen a lot of users here use sigs with their characters with the border and info. My question is how do I get one of those? Is there a template I can use somewhere?

Get your free Character Siggy is the site to get those siggys

Unfortunately they don't have any sigs for a sorcerer character but thankks anyway.

you could ask in the music and art section in community. There are a number of really talented people that may make one for you.