Presumably your company is going to give you something to do. Have a go at it, with what you've learned and by using the manuals, searching with google, searching here.
If you get stuck, show how you are stuck, and we'll see how we can help.
In the meantime, drop in here regularly and read the questions/answers. Things you don't "get", try to check in the manual. Stick to Cobol and JCL forums to start with, expand as you get to other areas you are going to cover in your career.