I figure if your just mowing some lawns your all set. You would have to file a DBA I believe, as thats what I did for this year, hopefully will be incorporated or a LLC next year. I have an edger and a hedge trimmer just out of the necessity of needing them to do my own yard, and a couple clients, so for me it paid off. I would see if clients want those services and if it makes sense get them. I found that alot of clients here do want a nice edge done.