They're segmenting professions by expansion. So that 100 skill level for legion is just for legion. There'd be another 100 skill in draenor blacksmithing or whatever. It's a better way to do it. As /u/UristMcUselessNoble said above: From what I've understood, instead of one one 1-800 profession, each Expac will have it's own profession level, which mean Classic will be 1-300, Cata will be 1-75, Legion 1-100 etc.
As a hero of the mighty Alliance, journey to the seafaring kingdom of Kul Tiras, home of Jaina Proudmoore. Untangle a web of betrayal and dark magic as you encounter power-hungry pirates, witches wielding death magic, mystical sea priests, and more. Explore the stony peaks of Tiragarde Sound, trek across Drustvar's high plains and red forests, and navigate the intricate inland canals of Stormsong Valley as you convince this fractured kingdom to join your cause.
If you're a new player and buying gold (for some startup money) isn't an option, there's nothing wrong with gathering (especially if you're getting BfA...it'll be good gold initially if you farm BfA mats and sell high). You can make pretty good money just flipping stuff...and because Legion items are super risky now, it's a good time to get spirits of harmony (just buy what you can and sell it in in bigger stacks at higher costs or turn it into ore/bars or lotus to sell when that is profitable). I'd avoid putting all of your gold there though. Sometimes a bot or just someone returning to the game will dump 10+ stacks of 200 spirits cheap and tanks the markets for a bit. Flipping (if you get good at it) will make you more gold in than long run than farming but if you don't have much gold either is a step forward from here. They key to making gold is having the flexibility to lock up most of your gold in items and wait patiently to sell them at a good price but you gotta start small (or cheat like me...when I came back in December I just spent $100 on tokens and haven't spent money on anything other than the Collector's edition since. It's a lot easier to make gold if you already have some.
I'm pretty excited about where the various gathering professions could go this expansion. Crafting expansions actually have good stuff to craft to prepare for the upcoming raid so gathering items will be needed. On top of that nodes are giving out less so more effort equals higher prices. Now where this goes past launch I'm not sure but stuff like Mining and Herbalism should be solid at the beginning.
Similar problems have risen in the leveling system, which automatically scales to the player’s level and equipment. For the most part, you’ll vaporize enemies more quickly as you gain power, but there are some weird dips. Many players complained they felt less powerful at level 119 than at level 110, a problem I experienced myself. And world PvP remains a strange and whacky world where level and class balance issues make wins and losses feel destined instead of earned.
Mythic+ rewards will also go up by 30 item levels; however, during the first week of Season 2, rewards from end-of-run chests will be capped at Mythic 6 quality (item level 385), and the chest you open next week will contain Season 1 rewards if you do a Mythic+ run this week. (So, for example, if you do a Mythic 10 during the final week of Season 1, you’ll get a Season 1 item level 380 piece and 60 Residuum from your first Season 2 chest.)