Start with To bid you farewell. That will get them interested so next song should be a heavy one (Demon of the fall is a good choice). then play some stuff from blackwater park.
I once played Bleak for my music class (back then when that subject still existed).
At the beginning of each lesson we had a thing called "musical dream journey" where someone brought a song and played it for the class.
The first time I played Master of Puppets for them, my teacher was not amused.
Some months later when I played Bleak, she was pretty scared. But both times she said nothing, because it was a rule that nobody comments openly, but makes comments only for himself in a little book.
Some people seemed to like the clean parts of Bleak, and the clean singing in general.
if you can try to get Windowpane, then possibly go for A Fair Judgement, Harvest,
To Bid You Farewell, Black Rose Immortal then end with Demon of the Fall