Are there certain colors for a kilt that mean different things or does it represent something. Like if someone wore a red kilt would it represent a social class or what family you belong to?
Yes and no. A solid green kilt often (but not necessarily) connotes an Irishman; a saffron one always does. A red, black, or blue one doesn't mean anything to my knowledge.
Someone wearing a Maple Leaf tartan is quite possibly Canadian; a "Leatherneck" tartan a US Marine, a person wearing the Ramsay tartan might belong to the Ramsay clan, or simply like blue.
Social class is generally denoted by eagle feathers; a gentleman with a grant of arms one, a chieftain two, a clan chief three. Only a clan chief wears the clan badge; everyone else wears it enclosed in a buckler. A clanswoman would wear a tartan sash over her right shoulder, the wife of a clan chief or colonel of a Scottish Regiment over the left. An officer in uniform (or wearing decorations with formal dress) denotes his class, a piper his, and of course, just like in all societies, "the cut of your jib"; a tailored silk Armani suit denotes an entirely different social class than a polyester off-the-rack WalMart sportcoat does.