Hey revan54115110!

Yeah it looks like you are starting to get the idea of the city together and have some initial plans and concepts. I agree with what Ascension suggested: Print it up, and just try your hand at a rough sketch (and scan). Then head over to the tutorial section and take a stab at some of the things that might work for your idea. Post it here and let the real fun start!

Some things to keep in mind while getting started to help you out:
1) Consider the history of the city - Where did it come from? What was the first structure(s)? What was it's purpose? Who built it? Is the city young or old?

2) Think about life in your city - How do people travel in the city - e.g. walking, running, swimming? What is the "center" - e.g. a military base, a market, a wealthy borough? How do people migrate from one area to the next - e.g. main roads, boats, horses, carts, wagons?

3) Think about tensions in the city (cities can be very diverse but very fragmented communities) - Are the merchants at odds with the duke? Are the sailors at odds with the caravans? Are the poor at odds with the rich? Are the native dwarves at odds with johnny-come-lately humans?

4) Think about the economy of the city - Does is survive on trade by land, by sea, by flying eagle? Are the mines near by? Is the city the capital, an outpost, the last of it's kind?

I hope that helps, and looking forward to what you come up with!