There was a similar thread a couple of weeks ago that didn’t seem to go anywhere.
Relax! I became an altar boy at the end of second grade going into third - you couldn’t be an altar boy until you had made your first communion - so that would have made it for me the summer of 1958.
First thing you need to do is learn to listen to and pronounce Latin correctly. Its not hard and I’m sure they’ll give you instruction. While it is admirable to memorize the Latin responses, in my day there were laminated cards that had all the proper responses that the altar boy could put in front of him.
Dress? I have to assume that you will be wearing a cassock and surplice. Check with your priest but I would think that you could wear long pants and shirt with leather shoes. Tennis shoes or sandals are a big no-no.
The next big thing is reverence. I don’t mean any harm or slander towards NO servers but there IS a difference in serving a TLM Mass. Oh, boy. I know everyone is going to come down on me for this but… I was an altar boy before VII and after VII. I can’t put all of it into words but when I served in a TLM, there was a profound sense of entering into the Sacred. Even when it was just Father saying his daily Mass with no one present but me, it was there. After VII and with the advent of all the glad-handing, hail fellow well-met, exuberance of post VII Masses, the sense of entering into the Sacred went.
If you are serving a TLM, remember that you enter into the Sacred. This is not to say that you can’t enter into the Sacred in a NO Mass (I’ve entered into the Sacred on a regular basis when I sang in our Cathedral choir). It’s just that entering into the Sacred is unfortunately NOT a part of regular RC experience.
Anthony, if you wish, PM me and I’ll give you whatever help I can.