I would seriously rethink this through before you send your younger brother and his friends out handing out flyers. Even if they do manage to catch a customer they will not well versed. Before you say you are sending out qualified lawn industry distributors, no one with any common sense or knowledge would even accept such a job.
What will happen is you will get 1 or 2 days worth of work out of them before they say screw it. So then you will be left with 45k worth of flyer's or they will just throw many out due to frustration.
You also have to remember that 'rich' people get bombarded with ads every day from every type of company you can imagine.
Why not just send out direct mail?