If you have a lesson between now and Sunday, ask you teacher to help you -- sometimes being shown something is much more effective than reading a description. But I'll try!
The lady should walk on the gentleman's right, so that your right side is to her left. Often the couples walk out holding hands, with the hand holding the lady's hand up in the air at about chest level. He's "presenting" her to the audience, sort of offering her up for everyone to look at. When you're done dancing, you present the lady your arm, and she puts her arm in yours (still your right to her left), and you walk off the floor together.
Well, that's the way I was taught it at least! Good luck this weekend!!