Actually I'm 21 alch so feel free lol. Alchemy/Armorer will probably be last for me since I just don't like Comfort Zone (or Piece by Piece) that much. I suppose it's nice for 'spacing' the craft out more and as long as you make it through the duration (without needing that bulk CP) you have a net gain of... 14? 16? Useful but I don't think it has quite as much potential as the other abilities.
One thing I can definitely recommend almost no matter your level though is do the GC turnins every day when possible though, great and easy XP. Sometimes it's worth just buying the HQ off the AH and turning it in if the price is right. And as far as crafting goes your levequest allowances are your best friend and I find it's best to start them around 20-25 so you're in the right range.
This thread has a pretty comprehensive list of available leves. The ones marked "triple" will be the best XP per leve if you're short on them, but if money is your main bottleneck stick to crafts you can HQ easily and/or are inexpensive for you. HQ turnin whenever possible, massive XP boost.
And my FC is Cult of Discord.