Cut out anything that is dead. Cut off anything that appears deformed or badly shaped that you just don't like the looks off. Sometimes cutting of long lanky canes will make them grow back fuller-forcing them to grow out some side branches. What you can do is google pruning roses or find a book at your local library with photos to help you see it. It will also tell you how to otherwise care for them if you are new to roses.
https://www.amazon.com/dp/1604693541/
this is a great book, I checked it out from my library, it has a lot of info on pruning, fertilizing, selecting roses, winter care ect.
