Congratulations on taking on this important role.
Be knowledgeable. Be prepared and know your subject matter. If asked a question that you don’t have an answer to, don’t answer it. Tell the questioner you will find out and get back to them. Then go and find the answer. Too many people get easily embarrased and think they have to have all the answers to be effective.
Name tags, have everyone wear them.
I also reccomend setting up a small altar in the classroom. It immediately lets the students know that this is not just another class to be endured but something special. As the year wears on and the students become more knowledgeable and comfortable in the faith, let them set up the altar weekly. It deepens their appreciation for the faith and it really works.
Have an opening and a closing prayer which after a few classes the students can do.
As scuba divers say, plan your dive then dive your plan. Preparation is all important so,
plan your lessons and then teach your plan. It makes teaching a lot easier and more efficient. Trust me on this.
Schedule a break in the class, that also makes it easier, not so much for your students, but for you. You’ll be wore out if you do this thing right.
Depending on the age of your students and the views of the Parish, you might incorporate some spiritual exercises into the classes such as those by Saint Ignatious Loyola. They are powerful teaching and self examination tools which are often used on retreats .
Plan a little more than you actually need for the class. It is better to have to finish up in another class than to be finsihed, have no questions pending and have an hour to go on the schedule. It does happen believe me.
Best of luck as you are about to undertake an vitally important role. Be assured of my prayers and those of many others as you underatke this job.