Play PlanetSide Now
Step One: Get the Software
Download, extract, and install the game client: PS Reserves.zip
Step Two: Get an Account
Open the Launcher and click on "New Account." You can try the game for 14 days for free, after which you will need to subscribe to save your progress.
Step Three: De-Newb yourself
While you're waiting for launchpad to install the rest of the client, read through this wiki, so you aren't ridiculously lost when you get in-game. A good place to start is evaluating your Empire choices.
Step Four: Play
Go ruin someone's day.