In your suburb you will find a wooden hatch set in the ground. In Temple Street for example it is Circle of Vaniki. These are your "Wholesaler Societies". There is one in each suburb.
Full list here In there you can do any tradeskill including cooking. They sell most of the things you need apart from raw materials which you can get by harvesting (They do sell some cooking stuff of inferior quality)
Look on
eq2traders for a full introduction to crafting or on the SoE boards for a
detailed introduction to the mechanics