The principal worship service in the Episcopal Church is the Holy Eucharist, also called Holy Communion, According to the Book of Common Prayer, the Eucharist is "the sacrament commanded by Christ for the continual remembrance of his life, death, and resurrection, until his coming again."
All baptized Christians are welcome to receive Communion at the Church of the Redeemer, not because we take Eucharist lightly, but because we take Baptism so seriously. These are the gifts of God for the People of God—and Christ invites everyone to be known and fed here.
All are welcome to the table for Holy Communion! At baptism, we are initiated as full members of the Body of Christ and can and should partake in the bread and wine of the Eucharist (especially children!). If you have not been baptized, simply place your arms over your chest at the Communion rail to receive a blessing.
The Episcopal Church as a whole has a great respect for traditional music and practices. The Episcopal Church service usually has lots of church calisthenics (kneeling, sitting, standing, etc.) Don't worry if you don't know what to do. Do what you are comfortable with. We utilize our whole body in worship. There are times to stand and listen to music, to kneel in prayers asking for God's forgiveness, and to sit and listen to the Word of God in both the scripture and the sermon.
There are also times in the service when you will see people cross themselves, some people genuflect or bow when entering or leaving a row of pews, some people prefer to kneel during a prayer while others stand. As you continue to come to worship services, experiment with these movements. You may find they help you achieve a prayer-full state of mind.