If you are looking to gain muscle and bulk up, cardio is a no no. To bulk up, you must eat more calories than you burn. So if your burnin like 300-500 a few days a week, thats setting you backwards and you are wasting your time in the gym. However, if you are looking to cut and make whatever muscles you have more visible, do cardio a few times a week. But do keep in mind, if you are cutting, you aren't going to get any bigger until you go back on a bulking phase again. In fact, if you don't do it right, you could lose a little muscle.
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