NM Dan Heisman has written just the article for you.
http://www.chesscafe.com/text/heisman79.pdf
Don't spend your time studying openings as a beginner.
Instead read this article and get all the basic open "rules" down first.
http://www.chess.com/article/view/3-simple-opening-systems
If MCO is considered too hard for me, then what books would you recommend for me?
The following opening books would be more helpful for a beginner:
Winning in the Opening by John Walker
Discovering Chess Openings: Building Opening Skills from Basic Principles by John Emms
Winning Chess Openings by Yasser Seirawan
Ideas Behind the Chess Openings by Reuben Fine
I was having a look at Modern Chess Openings today but since I just recently started playing chess, I have absolute no idea how to correctly interpret the charts that are on every page. Could somebody explain to me how to properly use the charts? Thanks!