Noob Starting out with a mod idea, need a guide.

[RykaSyn]

I've finally had enough of my villagers hoarding food and making their brethren starve. I want to make a mod that limited how much each house is allowed. Preferably based on house population, but based on house pop max would be fine too. Would I modify a file, make a new one? Where do I start?
I've got the mod kit, but I'm not familiar with the game's files, so I'd love a guide who is more familiar with what all these files do.