Which mage professions from 0-400Follow

Hope this helps:

Mage Profession gains
The whole list of Profession benefits can be found at http://elitistjerks.com/904932-post854.html
It is possible that the options get upgraded

* Jewelcrafting: +59 spell power and -24 stamina (or -16 spirit) with rare gems. +49 spell power and -30 stamina (-20 spirit) when/if epic gems appear.
You can use Prismatic gems to unlock your meta gem requirement, allowing you to skip the two blue/purple coloured gems.
* Blacksmithing: +38 spell power with rare gems socketed, +46 spell power once/if epic gems get implemented.
Epic gems are in the database, but with placehlder icons. They may or may not get implemented at all.
* These two professions also have the advantage that you can chose which stat you want to improve by chosing gems.
If we ever reach the point where crit or haste beats spell power, we can switch to these gems.

* Inscription +37 spell power, +43 spell power in the first 2 months when not Exalted with Sons of Hodir (daily grind)

* Herbalism may offer something in the +33-40 spell power region via Fire Seeds if you can properly stack cooldowns.
Fire Seeds have been completely non-functional throughout beta though.

* Enchanting +38 spell power, Leatherworking +37 spell power, Alchemy +37 spell power

* Mining, Skinning, Tailoring, Engineering are currently not competitive options for Mage DPS.
Lightweave Embroidery isn't better than a regular cloak enchant, and the Engineering gimmicks are only situationally useful.



With only having 800g I would consider a gathering profession and potentially a crafting profession that goes along with it. herbalism would be a good pair if you want to keep inscription for the shoulder enchants.

Alchemy isn't too bad getting double time from flasks etc.