Bridge to the City in the Sky was a failure but i made a underground city...-drum roll- Embar City http://img404.imageshack.us/img404/3253/embarcity.png check it

From the sky to below is quite a change. Personally I think a dungeon is easiest to start with, because it has clear edges for the mapset (rocks are better for a mapset edge than trees, in my opinion). The idea is still on my list of future maps, so maybe one day...

The map you made looks good so far, like Cleo said.
You might want to run the map validator/checker script to see what is not allowed by the server and fix it. Some mobs seem to be outside of spawn point, some quest markers outside of mobs. Running the map validator/checker will discover these bugs and tell you how to solve them. There is a strange object underneath the peasant in the old woman's house, what is it and what does it do?

Some suggestions for improvement: You should add some light sources (i.e. lamps, torches..) to your underground city, under the surface it's usually dark. You could add some pottery to the old woman's house, a library to the mage's, tables and tapestries in the castle, a scarecrow to the farm fields, some plants on the grass. Maybe some statues, be creative when adding details. Such aesthetics make the map unique and interesting to explore. You could even replant the trees so they're not in a straight line and maybe do the same with the dungeon edge, you might discover a tunnel to a new hunting cave when you do that.

~Kiana~

Great, can't wait for it to be finished
Embar City is a nice name. I don't know if you picked it on purpose but to embar means to bar or shut in; to inclose securely, as with bars. Which is of course quite appropriate for an underground city
If you need help with the scripts just ask. I'm sure there's some devs who could help you out with that
~Kiana~

How to make a key: Change the key string (slaying) to for example embar_city_castle and add the same key string (slaying) to the door(s).

Gates: They key might not work because you are using "gate"s in the castle. Gates and grates can only be triggered by time and connections. You should use the "metal door". You can find this in the arch-list by clicking "walls", then selecting "doors" from the drop-down menu or press ctrl+alt+A and search for "metal door".

Quests: You can find quest examples and their script on the testmap /maps/dev/testmaps/testmap_python (like I told you in-game). If you can't figure it out yourself using the examples feel free to ask.
~Kiana~

You're welcome
~Kiana~

You learn fast Adding the details is really an improvement. Dead trees because there's no sun. Some bookcases in the mage's house. The water system is well thought of, it starts somewhere and it ends somewhere.

Next step would be to give it more of an underground feel, you could add some rocks or pillars. Maybe add a few caves to the sides. I'm looking forward to it.
~Kiana~

Note that NPCs should be in spawnpoints too.
~Kiana~