I have spent a fair amount of time trying to work it out but it just doesnt seem to work

I have loaded up the project into eclipse, sorted out some of the errors on there (as described on the wiki).
However, I cannot run or compile anything.
It asks for the main class, and I am unsure what to provide.
Eclipse isnt my usual editor, I usually use Text Editor, however this seems to think that :
package com.sillysoft.lux.util does not exist
Sorry if I am missing something obvious, I havent used someone elses SDK before.
Hope you can Help.