Hi:)

So I'm pretty new to all the electronics stuff.  The extent of my training includes the Flashing LED heart kit from Radio Shack (I did have to solder some stuff). I have also done one other project with LEDs.

Anyways, I'm trying to make this without my boyfriend's help.  He has had to help me with the others because this stuff goes over my head.. Anyways, I want to take a wooden box (like from Hobby Lobby) and put LEDs in it.  Initially I wanted it to work just by opening the lid, but since that seems kind of difficult, I would also accept a switch...

SO, how do I do it? What kind of power would I need? Say I use 10 LEDs? Is that too many or what? I know I didn't mention the size of the box but I haven't bought one yet.  I don't want to start a fire, therefore, I'm not sure if the wall outlet (AC?) power is right or not.

I appreciate your help in advance.