Aluminum head question...

Ok guys, these questions may sound stupid, but this is my first go-around w/ aluminum heads, so bear with me...

Can I use copper header gaskets?
Do I need any special head gaskets?

I plan to use a valley plate for the first time,

where can I get a set of intake gaskets that isn't a valley tray?
How do you seal the valley plate?
I assume there has to be a bead or RTV along the surface that meets the head as well as where it meets the block? Does it use gaskets?

Thanks!