You should have a read through this: http://exeterchessclub.org.uk/content/ten-rules-opening
It's fine to learn some mainlines in the Ruy, Italian, etc. just concentrate on learning why the moves are made and understanding the ideas (it's usually all about controlling the centre).
Your opponents probably won't follow theory for very long anyway, so any deep studying of a particular opening will go to waste.
I am new to chess and would like to start learning some openings. I am a bit lost with this. There are so bloody many of them. If I were to pick two openings for white based on e4 and two for black in response to e4, which ones should I pick? Keep in mind my rating of 1200...