i like doing new fights blind. but however, explainations are fine if people want it.

but i think for the first try you should explain nothing. that leads often to a wall of text and nobody understands anything because they have not seen a single bit of the fight. when people have seen the mechanic you can explain it and then it is much more likely that people understand what you are trying to explain.

if someone puts a wall of text in the chat before a fight i don't care and just pull the boss. it doesn't matter because almost nobody can read all these, understand it, remember it when mechanic A, mechanic B, mechanic C... happens and then doing all the mechanics without failing.