Bismihi ta'ala
Alhamdulillah, all our esteemed Maraji' have official websites and easy channels of commication. Just make sure they are "official". Regarding scenarios or questions you might not find in his Tawdhih al-Masa`el, or Risalah 'Amaliyah, their websites usually have frequently asked questions, and you can also email, ring, or visit the office in person, or ask the Marja's wakeel.
And Allah knows best