Orbit player around center point

Im a game artist in college and we were required to make a game in unity for a project. because i am only an artist i have almost no experience with programming so i need a little help. I want to make the player orbit a center point in a circle motion while using the up and down keys to move forward and backward around the circle. any help would be appreciated!

There are a bunch of ways to do this, probably the easiest is to create a GameObject at the center of the circle and make the player a child of that root object. Put your movement script on that object and use the keyboard inputs to alter the rotation of the player root.