Subscription to the AAVSO Young Stellar Objects section newsletters can be inaugurated by simply sending me an email to that effect. Here are links to back issues of the newsletter - obviously the page looks a bit sparse at the moment, but that's because the newsletters have only been running for a few months!
when the page eventually becomes too full, the previous years will be stored as .zip files, each containing the 12 issues per year (that may be some way in the future!)