I finally started playing this, and I'm having fun so far. It's very overwhelming playing a new MMO for the first time, so I'm taking it slow. I'm level 9 so far. I'm looking forward to later on when the combat gets more involved, right now it's basically cast a dot, then nuke, rinse/repeat. I'm not even sure if the dot is needed, it doesn't do much damage at all. I've read some stuff how different classes rotations work, and it sounds exciting.
Few things I wish I knew when I started (started early May)
1. Level atleast 2 classes at the start
2. Pick between Mining or Botany or do both as early as you can
3. Pick up every profession as you run into them and start on them early
4. DONT SKIP CUTSCENES or you ill be very lost, this game brings back characters from earlier expansions constantly
5. If you see a blue unlock quest icon do it (unless its for a job you are not interested in), they always unlock something useful and every single thing is locked in this game be it dyes, melds, disenchanting, dungeons, raids etc
6. When you hit 50 start on the Ixal beast tribe to give your professions a boost, you unlock 12 very fast if you just focus on them, and they boost profession xp hard up to 50.
7. Moogle (50-60), Namazu (60-70) and Dwarf (70-80) are other profession beast tribes, I feel they are most important do after Ixal, it will save you a lot of time and gil doing them as whatever profession needs a boost.
Crafting in this game is not like WoW, multiple professions are needed to craft single items so it helps to have em all and its the main gil generator in this game
But most importantly, take your time, this game is 100% about the journey.