I've discovered an old gun. I know virtually nothing about guns. On the barrel it says: Companhia de Cartuchos. Made in Brazil. Elsewhere, SS Kregge. It's a 20 gauge that folds between the butt and the barrel. Sorry for my lacking use of terminology. Then, it has the thing in the back to cock it.

Anyway, it's been sitting useless for 10 years or more. What do I need to do to get it in working order(I haven't messed with it)? How do I even fire this thing. You're probablygoing to say that somebody with as little knowledge as me shouldn't touch this thing. I'm not planning on using it but I'd like a gun in working order just in case I need it.

Will I need to take this to a gunsmith to get it fixed up? How much will it cost? What do I need to know about the firing/safety of this gun?

Thanks