It is overwhelming to learn Buddhism and it is hard to know where to start.
In terms of Zen Buddhism there are the 3 pillars of Zen, but honestly I like to refer to the 8 fold path.
http://www.thebigview.com/buddhism/eightfoldpath.htmlAt the end of the day what matters more is that you practice Buddhism and IMO this boils down to a meditative practice. Meditate daily , start with even 5 minutes. It is helpful if you can find a teacher or local Sangha, but if not start on your own.
http://www.how-to-meditate.org/