How should i program my rpg?

Hello, I am a javascript programmer but i usually program applications vs a 3dgame or an rpg.

What would you fellow game programmers suggest as far as a structure? Would it be terribly inefficient to try new things as i go along? or is there a specific guideline to follow? I have done the tutorials from burgzerarcade.com in their hack'n'slash tutorials but i am curious if doing it my own way will hurt my game's end results.

For example. There are about 5 different class files in the tutorials for creating a set of stats. I would only be using one class file and cutting out some of the "getters and setters" to simplify the code but i cant tell if this can hurt me in the long run.