I don't know what order people SHOULD try anything in, but the order I went in was like this..
Cannabis
Alcohol
lsd
g
weak opiates (pills)
tar opium
dxm
ecstacy (three-point pills)
nicotine
salvia
pod tea
I may have left some things out, but those are the ones I remember (almost all of them were done during high school starting in my 2nd year, then cigs/nicotine and everything else came after high school). Pretty weird now that I look at it.