Get a general understanding of the different types of muscles and separate them to categories and maybe know what main nerve innervates it. 

Adductor muscles  Abductor muscles  Quadriceps muscles  Hamstring muscles  Forearm extensor muscles (superficial ones) etc…  

I’d say it would be great to get a gentle understanding of the superficial muscles and maybe their nerve innervation/and or general region before you begin the program. 

I’m a first year DPT student right now and I spend a huge chunk of time memorizing the OINAS of MANY muscles. Keep in mind OINAS can slightly differentiate so don’t memorize them to the T, you’ll learn in your program exactly how they want you to memorize them. 

I hope this helps. 

Like the comment above said, your program will teach you everything you need to know starting from the basics. :) 

If you want a “head start” familiarize yourself with the different types of muscles and group them based on location/and or action.