Thank you. I am switching to the Roman Breviary from the LOTH and am learning all I can beforehand.
I don't think the Martyrology is obligatory outside of choir. Although, it is encouraged.
Excellent. Honestly, my recommendation is, if you have the Collegeville set (or one with English rubrics), dive in one day, and just look at one hour.
I was at Adoration today, planning on praying the Little Hour (12pm), and wanted to do something else, so I read the rubrics and stuff for Matins. After about 15-20 minutes, I think I figured out how to pray it.
Baptism by fire! lol
(At least if you have the books)
Also, if you have any questions, post them here. We've got a good set of knowledgeable people on hand!