Help learn about development

Hello comunity, i'm back in the shaiya's world with a new question about real develoment.

I'm trying to learn how to make my own scripts or service for shaiya's server and my question is, what i need learn for make a develoment?
SQL,CE? what more? thank u



(sorry for my english)

SQL and CE is enough for a lot of scripts

Reversing / Debugging can be pretty useful as well