You say it's working on Wii Sports so I guess we can jump straight past the possible syncing/battery issues. But just in case: make sure the lights on the wiimote are lit.
2nd controller should still at least have a cursor on the screen, just no real control over any selection. For different controllers to take control, press the "+" button. Select your team and then in the next few screens you should easily be able to figure things out.