salvia 20x first time

I'm not sure if this is where I'm allowed to post this since its my first time on this site. I have a few questions about salvia 20x, I bought some recently and plan on trying it this weekend an only bought a gram since I don't know the effects it will have on me. My questions are since I have done any drugs in a few years how much should I put in my pipe  (tornado spoon pipe) and is it alright to drink alcohol before trying it or after the trip wears off?