How can I copyright and market my original-characters?

I created a character as a joke in art class. Surprisingly everyone really liked the idea and I got a T-shirt with the character on. I went further and created a set of these characters and some people told me to see if I could copyright and market them. I've had a look and don't have a clue where this is... show more I created a character as a joke in art class. Surprisingly everyone really liked the idea and I got a T-shirt with the character on. I went further and created a set of these characters and some people told me to see if I could copyright and market them. I've had a look and don't have a clue where this is done or how much it would cost? (I'm in England so and English copyright would be better).
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