How to make custom portal map and put it in SFM?

[Zircon_72]

I wanna do something like this:
http://youtu.be/Fg_upWufK3A

How would I make a map like that?

[Zircon_72]

no, no. I want to make a map like that and I'm asking how to because I don't know..

[TeamHalfPortal 3]

Why didn't Valve put Portals or the maps??? Why???? How are they expecting us to make saxxy worthy videos if we don't have all the essentials??