The sentence translates to “The men sell cars.” So I would personally say yes because I do not see anything wrong with it. So yes it is correct.
soy claudio. hace mucho frio hoy en caracas, y tenemos que usar el abrigo
Well, if you want the answer for "I would tell them to know what they want to do before going to college", then it's " Les diría que sepan lo que quieren hacer antes de ir a la universidad "