If you are a Complete "Noob" to LCS Action and Want to Get Involved....
...start by watching all of "Fnatic" and "Team SoloMid" games for Season 5 (start with week 1). Then just watch these 2 teams play (one EU one NA) their matches each week. Watch Prime Time League for general understanding of overall situation.
Watch the World Finals for Seasons 1-4 if able. Then in no time you be all caught up and have a general understand of LCS.
BTW I understand how the LoL Esports site is very confusing and overwhelming to use at first... however with training it will become second nature in time.
Note: There are many teams in LCS... however like with most "sports" only a few are skilled enough to watch. True; one of the lower tier teams may come through the ranks and prove themselves nonetheless, if you are completely new to watching LCS you need to familiarize yourself with the "Tier One" teams and what they can do first. Watch them play as they usually have the best skills and you will learn the most from them.
Only then will LCS action make more sense. Once you have a general understand of "who is what and why" then you can expand outwards and do research outside that realm. IF you try to do everything at once you will mess with your brain and get lost very fast.
Indeed it is so...