I've come to Orthodox Church and joined liturgy workship for several time, but I still do not know what I am doing and what the priest is doing in the Liturgy workship....
Step one, get a text, as someone has already linked. Your parish may also have some in the church hall or in the temple itself, and you can use those to follow along.
Step two, meet with a priest. They'll be able to tell you what you don't know and provide really definitive answers to it all.
Step three, attend the inquiry classes, if there are any. This is a GREAT way to learn about the liturgy and have questions answered, as well. You'll also learn about the liturgy in an in-depth manner. Our parish has classes where we go through the text of the liturgy, with explanations of everything, and our priest is there as well, so it's really really conducive to asking questions and learning about the "what" but also the "why".
As to what you do, just watch, and listen. Watch the parishioners and see what they do (and follow along if you can once you're comfortable), watch the priest and what he does, and the deacons, as well, and listen to the hymns that are sung, and what everyone says. Take notes (mental or otherwise) of what you want to find out, then after the service, go ahead and find answers.
I was the same way - I'd never been to a liturgical church before more than once, and after only a few weeks of attending, I was able to get the hang of things. You'll get there - don't rush it and don't worry if you make mistakes or get confused - there are plenty of people out there who won't mind you asking questions. Oh, and one more thing: just try to experience it. It'll sink in the more and more you attend