Just be honest and provide good service............ There are a few big dogs and dedicated drain companies in the area, so I'm not sure what kind of calls I'm going to be getting,............
Never hesitate to take an extra moment and explain why you're doing what you are doing. 10 years from now when you've got this down pat and have a big business you can be curt, only discuss the minimum. For right now your best bet will be showing customers that you want to make everything turn out right. Don't be like every other schlep who regrets having to snake their schit line because it's his 9 to 5.
And find someone who can be an azzhole and chase down bills. It's a worse job than the snaking and it's takes one cold hearted son of a beach to call someone and demand payment under threat of legal action. I have yet to believe I could be that kind of person, that's one of the reasons I'm still an employee.