[RM2K3] Some rather complicated game parts

Alright, so it's been a while since I have been on RPG Maker 2003, but I still have my knowledge from before. The reason why I stopped was because I kept running into the same issues and I didn't have the resources to overcome them.

The first is I can't find a good explanation on how to make a Custom System. I'm sure that once I have a good base explanation, I can really manipulate it to my advantage.

The second is I need some sort of system that makes bars go down as you do not fulfill needs. Sort of like The Sims' motive bars, except less extreme, because I only need a few bars.

A basic explanation or a link to a great tutorial site would be great.

Thanks.