I'm personally not a cosplayer, though a few friends are dragging me to one as Ciel Phantomhive. As far as the preparations go, it's pretty expensive. Apparently a lot of cosplayers prefer it if you make your own costume, though you can certainly find some very well-made costumes if you've got the money. Just be sure you do something that can look good. You don't want to become one of those cosplayers people like to post up for laughs.

The other thing is friends, as I think this would be a very awkward experience if you went without people you knew. I know I probably won't be doing it again due to the price of it all.

You're wanting to go as a furry though so I have no suggestions for that