Salvia is completely different from probably any drug you have ever tried. I myself have done just about everything in the book aside from heroine and meth, and I can say for a fact that salvia was most definetly my strangest experience. If you want to try the drug before you decide you would actually want to try and grow it, you can buy it at local novelty shops in the U.S., its usually right beside where you buy pipes, rolling papers.. etc.
The salvia itself usually comes in 2 different forms. The novelty shop where I live has a regular bag of dried salvia leaves, and a more potent refered to as an extract. The extract comes in doses ranging from 10-40x. I started out buying the 10x and it didn't produce much of an effect, so I suggest just dishing out the little bit of extra money and buying at least a 30x extract.
Smoking it through a water bong is the best way to go about it, as you can burn the entire bowl and hold it in your lungs until the required 30 seconds has passed. If it hasn't hit you after the 30 seconds, it will certainly hit you as soon as you exhale. The beginning of the buzz is probably the weirdest, you will feel what seems like 50 pounds of gravity (if that's how you measure gravity lol, hell if i know

) pushing down on your shoulders and the rest of your body. Moments later will you lose all sense of reality and be thrown into what feels like a dream, the experiences vary from person to person of course. When my friend tried it he though he was an alien piloting an alien mothership. I myself turned into a painting and was stuck on my garage wall. The actual "trip" is very short, and usually lasts only 1-2 minutes before you realize whats going on. After that you feel a little sweaty, and might have a head change for the next 10 minutes before your completely sober.
Warning: If you don't like tripping (acid, mushrooms), I wouldn't recommend doing this as the experience is probably 5x as intense but only lasts a few minutes.