Crafter's Guild Quest
You can start the Crafter's Guild quest by hailing MacGuyver in the Nexus, and creating the necessary items.
A guide on the Crafter's Guild Quest is available on the EZ Server forums's Crafter's Guild Guide.
There is also a fantastic visual guide put together (PDF format) based on the above guide by Reddwarf that can be viewed here.One side note on the guide: due to changes in AA's on the server, you no longer need to level up jewelcrafting! Now any character can get JC Mastery AA!
Alternatively, you can purchase the Crafter's Guild flag for 12 EZ Credits.
Troubleshooting
Missing Crafting Stations - I can't find or see them
This can be caused if you have modified your GlobalLoad.txt in the everquest/resources folder, ensure the following line is present, if not, the crafting stations will not be loaded/visible.
1,1,TFTFE,GEquip,Loading Character Equipment Files