What time period (or perhaps more accurately technology level) are you trying to emulate for your city? Is Gryrax the largest city in Ulek? What type of a population do you want? What do you want the city to feel like?

There's a lot of resources out there about how to build cities (check specifically in the city mapping section and I think you'll find some great inspiration... I did.) But I think you at least need to know the approximate time-period, and what you want from the city, before you can really begin.

Good luck!