I have been involved with lift trucks for 50 years (this week is my anniversary). I started my own company/dealership about 35 years ago following a rewarding career as an award winning tech, and 2 years as a service operations manager for an industry leading dealer. Do yourself a favor and stay with your trade until you learn all aspects of the hands on requirements. Then (important!) get in on the management side to learn what it takes to run a service department and how to price your service, parts, and rentals. If you fail to get management experience you will leave a ton of money on the table. Good luck!