OK OL dont mind H, we all go a bit strange at times.
Go to lemans.org which is the official site. From there you can find a link to the ticket office, and send them an e-mail. You just ask for however many circuit passe that you wnat (sounds like 2) and a camping pitch. You will need to quote your name and adress in the e-mail, or they wont accept it.
Camping is the real tricky bit. It gets to be abit of a lottery, and even very experienced chaps sometinmes end up where they don't want to be. Many folk on this forum prefer Maison Blanche for camping whilst other prefer Houx or Houx Annex. Frankly you can ask for whatever you want, and you'll just get allocated with something.
Book now...........don't leave it any later. They will eventually send you a confirmation form which has to be returned with payment.. This can take months.
On the topic of beer drinking, I would not like to encourage a chap of your years to get involved with the filthy stuff, but the bars around the course are pretty open, very busy, and I shouldn't think many people will look twice. No idea what the legal age is in France. (Too old to care)