hello and welcome! i think it would be perfectly fine to attend HIS first AA meeting with him, to help ease the anxiety a bit and help him get the lay of the land so to speak. but long term, its best for each of you to attend your own meetings solo.....so that you can get the full experience without interference or concern for the other. that he WANTS to go is good and anything to get him in the doors is encouraged!!!
please feel free to share a bit more about YOU....as you feel comfortable.