just got an epiphone hummingbird and has some smudges on it. how can i get rid of them?

a clean towel is the best to use. barely dampend with warm water helps, but you need to get all the water off or risk ruining your guitar.

well nice choice of guitar might i say first.!!!! ;)
well it all depends on the smudges.
you can probably just use a damp cloth rub it on till it goes then dry it remember to dry it V important.
but that should work.

Body: Clean it with a dry cloth.
Fret: Clean with dry cloth and apply lemon oil** every time you change strings.

**lemon oil is optional unless if your guitar is very precious (monetarily and/or emotionally).

!!!CAUTION!!!: never apply moisture (it can make the wood expand thus ruining the guitar's body and sound)

Additional piece of advice:
Some guitars have different makes (e.g. wood, hardware, details and other materials) which require different cleaning approaches. So I just gave some very general methods. For a more detailed means of cleaning your particular guitar ask an expert (most probably someone in the store where you bought your guitar) when it comes to maintenance and cleaning...