Takes years to master but only takes about a week or two to learn the basics... He said he wanted to learn how to map, not master it.
Anyway the best place to start would be
http://www.planetdeusex.com/constructor/tutorials.htm
Thats where i learned the basics, hopefully you will too.
Oh and try to keep all the measurements of brushes in the power of 2 like... 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4069, 8192, 16384, 32768, 65536, 131072 ... Etc..
Jet if you need anything, help etc then go on msn.
EDIT, again

: Jet, im good, but there are people much better then me like mantra, zero presence etc.