It's all so confusing.

I would like to grow weed. I have an empty wardrobe about 3ftx1ft in which to grow. I only want to grow enough to use, which isn't much at all, maybe an eighth a month. Would this be possible to do without in depth knowledge (although I am willing to learn)? how much does one plant produce? How simple is the very simplest way to do it?

thanks for any help.