I have a 10 string guitar that I don't know what to do for strings. It is a 5 string guitar with doubled strings, also tunings??

Sounds like a Brazilian "viola caipira", or another regional type of "viola". Not the same as the viola you see in orchestras - see link for more info. There are a lot of these odd (to North Americans, anyway) guitar family instruments in Central and South America. They branched off before the guitar evolved into its modern form.

P.S. Several types of 5-course violas are also found in Portugal (which probably explains how they got to Brazil).

Are you sure it's a guitar? There are no regular 5-string guitars with double course of strings (making it a 10-string) that I'm aware of.

Apart from that, there are indeed acoustic as well as electric 10-string guitars and the type of strings will depend on the guitar.

This is the guitar, It's solid oak has a pickup, weird little nuts all around the body. This was handmade by someone I know and passed on. I'm thinking of doing an open tuning and not put one set of strings on. I play guitar....I know what they look like :P

Yea OK, double strings huh? Sure that's a guitar?

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