If you want to understand anything about the technical side of it, a guy with the youtube channel called "Chain Bear" does brilliant explanations of nearly anything you want to know about the cars and how they work.

https://www.youtube.com/user/chainbearf1

Autosport magazine is great, and they post a lot of news/analysis videos.

https://www.youtube.com/user/AUTOSPORTdotcom

I get most of my news from https://www.motorsport.com

Planet F1 is also really good: https://www.planetf1.com

I follow a bunch of people on Twitter. Adam Cooper is a good one: https://twitter.com/adamcooperF1

Ted Kravitz does his "notebook" segment before and after every race for Sky Sports, and you can usually track those down on youtube.

Other than that, just start watching. Preseason testing starts next week, I think.

I went ahead and bought the F1TV subscription last year, cause I got tired of fooling with streams, but there are plenty of those around. But I think ESPN still has the contract with F1 this year, if you have cable TV (I don't).