>>784992
>What is there that I should know before attending mass?
Be presentable.
>I am planning to go to an Orthodox Church on Sunday, but don't want to mess up and/or do anything blasphemous. How does a usual liturgical procedure operate?
Just have attention to what is sung and preached, and follow what everyone else is doing.
>What do the attendants actually do during the service?
Pray, kneel, cross themselves, sing along.
Depends on the period of the liturgy.
Again, just do what everyone is doing at that moment.
>How should I take communion, should I even? Please help
Given you aren't orthodox, don't.