Would like to know if it is possible to start a digital marketing agency without much experience and still be successful by figuring things out along the way.
It is not necessary in todays world. Many people take the "middle man" view which is to out source or sub contract the actual work. While you remain the name and the brand of the agency.
Technically you could start with zero marketing experience and contract the work out when you get it.
This way of doing it is actually really smart business practice.
Feel free to call me if you require a more in depth / step by step guide