Lights - add a new key (a data entry in an entity, like a light) by hitting the + button when you have it selected and are viewing the 'entity' pane.
It'll create one without any useful data inside, you need to first name it 'light' and then give it a value. By default lights have a value of 400 if you set nothing.
There are various others keys to be added to a light that can give you more control, but you're better off reading more comprehensive documentation for that;
http://shoresofnis.wordpress.com/guides/lighting-basics/
To make a door select one or more brushes and right click on it. Select the option 'create brush entity' and then func_door.
These also have a bunch of keys to set for speed, distance and so on, this is a pretty good guide;
http://www.quakewiki.net/archives/worldcraft/entity/standard/standard.shtm
Good luck!