You may want to think about having them attend the altar boy instructions for a period of time before they are even allowed on the altar. For this particular role I am not a friend of ‘learning by doing’ as it can be very distracting to the congregation if the boys don’t know where to go and what to do and are constantly directed throughout the liturgy.
It’s also not fair to them as they must be feeling uncomfortable stumbling around and trying to figure out when to go where and to do what.
I think a good way to start is have a few lessons on basics, e.g. what are the names of all that can be found in the Sacristy, what are the parts of the Mass and what do they mean, also have them memorize all the prayers of the faithful (Gloria, Creed, etc.). Turn it into a class that requires some sort of studying/homework and have them take a test they need to pass in order to move on to the class teaching them specifically how to serve on the altar.
This way those boys who want to serve simply because ‘it’s better than sitting in the pew with the parents’ will probably drop out because they are not particularly interested in putting much work into this. In some places I have seen altar boys slumped in their chairs, playing with their fingers, yawning, not having their hands folded. It did appear as if they’d rather been somewhere else.
Teach them how important their role is, that they have a big responsibility and privilege as they can bring people back or closer to God simply by the way they are serving.
They can be either a distraction or an inspiration for the congregation, there is no gray zone in the middle.
Teach them how to bow, how to genuflect (not like a jumping jack…).
If you can weed out the ones that are not serious about it early on, you can do wonders with the ones that actually are serious. It will make the liturgy so much more beautiful and reverent.
I have also seen boys who served so reverently that it did touch people and inspired them to pay more attention to the Mass.
It does make a world of a difference having boys who serve well and are serious about the special role they have.
There are also good books on serving available at good Catholic bookstores. They will give you an idea too.
I wish you success for this undertaking
