Step number one:

Create an awesome framework that people want to use (Meteor started out as a travel guide site, I believe, and other YC batchmates wanted to use their web framework)

Step number two:

Keep building the web framework

Step number three:

Raise money to keep building that framework, with a partner who believes for the long term

Step number four:

Keep being awesome, and become the tool that a ton of devs want to use

Step number five:

Monetize with your own enterprise support and hosting