Yea I remember doing that project as well. To make a Coat of Arms you should through in a couple of insignias, maybe your sign (IE Pisces, tauros, cancer ect), and maybe a few crucifixes for good measure. But, remember it is YOUR coat of arms.
Mine has a Dragon fish (I'm a pisces born on the year of the dragon) thing wrapped around a cross holding a calligraphy bush in his left hand and in his right hand was a Playstation controller. There was also some random things dealing with Videogames and art drawn on their respective sides. Got me a 94!

BTW, you probably will have Ceaser next year, Othello your eleventh year, and finish with Macbeth your twelth year.