Welcome Derek! I also took a 50-year break from clarinet. But I did play flute and some sax for 40 years ... Then I went to a concert of E European music and came out declaring "I gotta get a clarinet!" Wow, was I in for a ride! It's been an obsession for 6 years now. I perform in Jewish services, I collect, buy and sell, do repairs and improvements ... I play clarinets in C, Bb, Eb alto ... good thing I'm retired from my old career! It's an instrument that demands a lot, but gives much in return.
I found a local teacher, really a necessity, took lessons for a year. We agree that the old Rubank books are excellent. There are great online resources now. Michelle Anderson videos are some of the good ones, for example
ClarinetPages has been a wonderful resource and a great sharing platform. Enjoy!