He will just need to go to confession, then communion and eventually into a Confirmation class. Its part of growing into the faith is to be confirmed, if he wants to eventually get married, being confirmed is a pre requisite.
Anyways, being as young as he is he will indeed need someone for support. Either a pastor to become his spiritual director or a trusted, devout adult in the community or both! Like everyone said here, you cannot just get this like a light switch to just turn it on and off. Being a catholic these days requires one to stand up to the faith, Catholicism is not for wussies. What helped us a lot to grow is to do service in any way we can, the parish, and we found out that we have a passion in serving the youth…we have helped out in NET ministries and now we will be driving down to San Diego this weekend to volunteer for the Steubenville conference.
You know what, I think it helps teens to grow when they see kids their age being passionate about it. I suggest you guys should go to a Steubenville conference next year, they have bands, games, great talks and tons of prayer time that includes adoration and mass. Eventually you have to kick start that fire of wanting to know more, of wanting to get closer. Since you are the sort of driving force for him, go with him to one of these. Get busy!
God Bless and hopefully we see you next year!