Level editor tutorial needed

Blitz3D Forums/Blitz3D Beginners Area/Level editor tutorial needed

OK
I have seen mappy and a few other level editors, thing is I want a detailed step by step explanation of both the editor and implementation into blitz3d. I want to code a level for a 2d game but am struggling to understand how best to go about it, the examples I find are not very detailed.
Anyone point me to a decent tutorial or even a book?
thanks