Well it sucks that you don't have any friends to go with, as that makes it a lot more fun, but I've only been to one convention, and it wasn't a Pony Convention, so I wouldn't be able to give any advice on stuff like that. You'll for sure meet people who are just like you, and have the same interests that you'll end up talking to the entire time, it happened to every one of my friends, and that is how I know some of my friends today.
Basically, be social and you'll find people you like