Even though you are only one person, you can still be a helper. Some people are just looking for one person to help them with the heavy items. Or they already have neighbors or family helping so they just want to hire one person. It is a way for the customer to save money by only hiring one person and still getting the help with the items they can’t lift themselves.
You are still going to have to have the equipment needed for moving. If you do need another person for a moving job, you could also get a friend to come along or hire someone else when it is needed. You may not get as many job as a bigger moving company.
Eventually, your little company may grow and will develop into a bigger moving company.