No strap on main awning. How do I know the length I need?

The awning strap should be a little longer than the extended awning so that you can grab the end when the awning is rolled up.

Does the light that does not have a switch have a wall switch to control it? You do need some way to turn it on and off.

Removing the light covers depends on the lights. On mine I squeeze the cover and pull it off. Shouldn't take much force. If it doesn't come off, try something else.