Don't be afraid to ask questions. You might like to ask:

Why am I having radiotherapy?

How long will my treatment last?

When will my treatment start?

Where will I have my treatment?

How often will I have to come for treatment sessions? How long will each one last?
What side-effects might I get? Will they be short- or long-term? How can I deal with them?

How does radiotherapy compare with other treatment options? Why are you recommending it?

Will I still be able to go to work, and do other normal things?

What are the chances of the treatment working? When will you know whether it has worked?

What will happen if I don't have this treatment?

What can I do to help myself, before, during and after treatment?

What will happen after my treatment has finished? What follow-up appointments will I need?

Will I need any more radiotherapy in the future? Will I have any other types of treatment?