Seems like I'm replying to a lot of your questions! There are at least a couple of ways to add vib; you can use your diaphragm muscle like a flute player (takes a bit of practice) or just alter your lip pressure (think woo-woo-woo) as you play. To be honest though, since I've just answered your question about embouchure I'd suggest steering clear of vib until you're happy that your sound is stable playing pure tones throughout your range. Plus it's not always appropriate, so you need to be able to start and stop at will ;-)
Nick