You may want to watch some Orthodox Divine Liturgies online, so that you get a sense of what the worship is like and also see how people cross themselves (first the forehead, then the middle, then the right chest, then the left).
There are several videos of different Liturgies available here:http://www.goarch.org/en/multimedia/video/#divineliturgy
God bless you!
P.S. Don't forget about all the resources available on the goarch online chapel, including the texts of Orthodox prayer services, the Scripture readings for the day, sermons, etc.http://goarch.org/en/chapel/OnlineChapel.html