I am 15 years old and my brother and I are starting our own business next year. We've got most of the equipment we need (except for a truck and a trailer obviously), but I was wondering if some of you guys could give me some advice on 21" and/or 36" lawnmowers. we will be doing mostly small residential yards (at least when we first start out). if you have any other advice for someone who is new to the business, feel free to give it. Thanks alot guys!