"The way the glyph market works on most realms is that there are a couple of people willing to put in the long hours who will have every available glyph posted profitably, and undercut within minutes of being undercut. They all reduce the price very minimally when undercutting, and the "competition" isn't about price, it's about who can relist more frequently.
Making gold = work, people just want to be lazy and cash in but today a lot of people use TSM, have access to this reddit, youtube guides, etc. More and more people play wow to make gold so ofc the AH work gets harder, you just need to find your niche, i'm making gold with Tailoring from MoP and Cata for transmogs, not a lot of work to farm maths and i sell each piece around 10k, 7 pieces per week and i'm fine for a month.
Professions skills are split between expansions now, you'll have a separate skill bar for each expansion. There are still 950 profession levels in total, just that there is no one single progress bar with 1 to 950 for it anymore. Instead, there are 8 separate progress bars. (The only exception is Archaeology, because it will still have a 1-950 progress bar)
A Aegwynn Alliance Aegwynn Horde Aerie Peak Alliance Aerie Peak Horde Agamaggan Alliance Agamaggan Horde Aggramar Alliance Aggramar Horde Ahn'Qiraj Alliance Ahn'Qiraj Horde Al'Akir Alliance Al'Akir Horde Alexstrasza Alliance Alexstrasza Horde Alleria Alliance Alleria Horde Alonsus Alliance Alonsus Horde Aman'Thul Alliance Aman'Thul Horde Ambossar Alliance Ambossar Horde Anachronos Alliance Anachronos Horde Anetheron Alliance Anetheron Horde Antonidas Alliance Antonidas Horde Anub'arak Alliance Anub'arak Horde Arak-arahm Alliance Arak-arahm Horde Arathi Alliance Arathi Horde Arathor Alliance Arathor Horde Archimonde Alliance Archimonde Horde Area 52 Alliance Area 52 Horde Argent Dawn Alliance Argent Dawn Horde Arthas Alliance Arthas Horde Arygos Alliance Arygos Horde Aszune Alliance Aszune Horde Auchindoun Alliance Auchindoun Horde Azjol-Nerub Alliance Azjol-Nerub Horde Azshara Alliance Azshara Horde Azuremyst Alliance Azuremyst Horde
Otherwise, its a pretty lackluster expansion profession-wise as there are no useful sellable gear besides Inscription trinkets. Legion had good and variety stat gear across all professions (JC could make BiS socket-rings, now JC is the worst proff ever, so sad). I hope they change stuff soon but I'm not optimistic about it. You should probably level Pandaria Engineering and Alchemy as much as you can on your characters and invest in Ghost Iron Bar/Trillium Bar transmutes to either sell Living Steel or hold them to craft Sky Golem (30-40k profit each char per month). It's hard to maintain a steady flow of GIB/TB though. I "only" have 6 engineers and my stock drys up pretty quickly.