Read the first few chapters of the EV Nova Documentation before you start. Everything you need to know to begin playing EV Nova can be found right there. Mac users will find the built-in manual accessible from the Help menu at the top of their screen. Windows users will find the documentation in their EV Nova folder.
Once you get the basics down, your path through the game is entirely up to you. EV Nova is an open-ended game that allows you to choose your own course of action.