Wrong forum, you should post it in the Map development forum.
Game Development: The place for game designers to show off their work, get help in their game-creation venture and discuss their ideas. Be advised that this forum is not related to Warcraft III modding.
Quite frankly, there's not much to even be said about your work at this point. Clearly, you are still at the early stages of the development, so I think you should just continue working on your project and come back a bit later
One piece of advice I can give you is - don't attack yourself and don't say "oh, I'm a noob, what I did sucks...". I fully understand that as someone who, judging by the voice, is probably very young and has just started playing with the map editor, you might feel insecure about your capabilities, but don't be too hard on yourself Yeah, you are a "newbie" and obviously what you have done so far is pretty basic, but guess what - everyone, even the best mappers and modders out there, have been in the very same place you are now at some point
The major difference between you and the more experienced map makers is that they have played with the editor far longer and just had the time to learn a lot more stuff. What I'm trying to get at is - just keep working, try out different things and even though your first few projects probably won't be that amazing, eventually you'll get there
3. Probably the best way to learn basic things in W3 editor is just pure experimentation combined with reading some tutorials to widen your perspective and overcome some of the issues you will run into. Don't be too ambitious at first! Start with something small - like, creating a map that has some sort of terrain, or doing basic triggers, or just adding a custom doodad, etc. Once you get a hang of the basic stuff, you can slowly start learning other things
Oh, and as for your importing problem - I have never experienced something like that, but I one thing that comes to mind is that perhaps the issue is with your editor not having the permission from your operating system (Windows) to modify the hard drive directory of you Warcraft 3 installation.