How to write a set design for julius ceaser? Please can someone tell me?

There are so many designs and adaptations of design that you can consider. Unfortunately this is not the forum for this short of thing. I would be inclined to consider the simple classic design of a Greek theatre but you will need to look this up on your own.

but please can you gve me like an basica idea about how to write a set design for julius cease?

Sorry, I'm really not a set designer. I have not really written one before.