Your question isn't simple to answer. The one advice I can give you is to try modifying windows & scenes in the basic RMVXAce Script Editor and see the effect. I've learned RGSS this way, by trying and trying, modfiying variables here and there, understanding
while and
for cycles, the
if / then / else structure and, last but not the least, the
definitions and the
attributes.
I think you should give a look to any basic Ruby book about classes and methods and then try applying them to RMVXAce. Seriously, just remember to copy the Script.rvdata2 from the Data folder in order to prevent your scripts to crush the engine

Just try without hesitation... and ask support when needed

Jens