Mangiare is a pretty regular verb, don't worry :)
mangiare - to eat
(io) mangio / (tu) mangi / (lui) mangia
(noi) mangiamo / (voi) mangiate / (loro) mangiano
You can find how to conjugate it and other verbs a bunch of places online. My favorite is Wiktionary since it gives me the most information.
Right now we're only working with the present indicative.