Building a local wikipedia from scratch

I'm looking to create a personal wikipedia-esque website, both for pleasure and for personal use. I'm aware there are companies that offer such a service, but I'm interesting in doing it from scratch.

That being said, I have two questions: 1) is it possible (I have an introductory knowledge to html, css, php and python 2) where should I start

My main concern lies behind the creation of an editable template for the wikis to be created with.

Thanks,

Troy