My dad has been working as a private contractor on the side in my town, for about 5 years now. He mostly just does jobs for friends, and through recommendations from them, and so on. He does not have an official company, or phone number, or business name or anything. I told him he should quit his regular job, and start a business in my town, as he has to deny most of the work he is asked to do, because he does not have the time. He agreed, and we're trying to see what steps he would have to take to officially become a business.Would he have to get it registered through the city? Can he legally just come up with a name and start advertising for himself? I was going to help him make cards, and stuff like that, but I feel like it can't be that simple, right? He does all kinds of construction work for people; hvac, kitchens, plumbing, flips. Any tips or steps would be greatly appreciated. We live in New Jersey, if that helps.