Before you change router (I'm assuming you've bought it and have it with you) you'll need your broadband login and password. This will be the one that connects your router to your ISP (orange) and will be similar to the email address they gave you. If you don't have this written somewhere you can find the log in by opening a web browser and typing in the URL 192.168.1.1? or 0.1 at the end.
This will take you to the admin console of your router. You'll need the log in and password which if you haven't changed it, it will be admin and 'password' Although the username could be Admin with a capital A.
In there you'll be able to find your internet log in details, however, I'm not sure you'll have the password.
You'll need this info to set up the new one. Once this has been done we can worry about the wireless bit.