In 3 years I will move to US and apply to YC, but that's forever away. I want to start doing now.

Is there a checklist, or a blueprint, or a list of topics, or a list of books that you can recommend that will cover the most important/basic/low-level aspects of building a company? What should I be thinking about?

I'm looking for the backbone; I can work on figuring out the proper shape of what I'm building along the way.