:welcome: Welcome to the forum!
When you say yards in town what size do you mean? The yards I do are around 0.25 acre, and I use self-propelled 21" mowers, but you get the efficiency when you use a wider mower like a wide area walk behind, stander, or zero-turn. As for tips, you want to have good, reliable equipment, but don't spend tons of money until you know you'll have the amount of customers to pay for it. Advertise a lot, including yard signs and flyers. You don't need to pay big bucks to get professional-looking marketing tools, and also utilize free things like Facebook. :thumbsup: