I have written a paper to explain how to create your first Middlet.
This paper covers the following topics:
Nokia PC Suite
Once you have read the paper and you have created your first Java ME Project with the classic HelloWorld Middlet example, then you could use the Middlet REMOTE NXT which you can you to send LCP Commands to your NXT Brick.
http://lejos.svn.sourceforge.net/viewvc ... nk/javame/