Logo is kind of cool IMO but as others said Business Cards and possibly flyers to leave in mailboxes are a must to get your name out there. There is also a great fairly new Social Media platform that targets homeowners and their neighbors and you can post for specific neighborhoods you want to target. Try the app Nextdoor I think you will be happy with how targeted your marketing can be.
Names: Lawn Ranger | Blaze Mower Lawn Service | Turbo Tracks | Blaze Mowing
Let me add, It is so refreshing to see a 14 year old taking the initiative to do research, ask questions and solicit feedback. Just having the drive to start your own business gives me hope for the next generation that I would have thought was a complete loss. Good Luck!