I'm a 20 year old and I currently weight around 63kg. I'm about 180cm+- (6 foot or so).
I have never trained a day in life, nor do I do any sports or any other physical activity. I'm in college, full-time, so I usually don't have the kind of time to think about working out. I'm finally on holidays now so I can spend some time on myself for the next month or so.
Needless to say that I have no experience whatsoever with training or diets. I'm of average build. Not skinny, not tubby, just average.
I would like to buff up just a little bit, but I have no clue were to start. I'm not looking to be built like a Pro Wrestler or 90's Arnie (

I don't really have a diet that I'm following. I mainly eat some instant meals (spaghetti bolognese, pasta, assorted vegetables, chicken a la king, rice etc), occasionally some fast foods (a burger or so every odd week, and some pizza, chicken wing + chips) and some snacks (some potato chips etc).
I don't drink fizzy drinks, I usually drink juice (some sparkling) and I don't go a day without drinking at least 1 cup of tea (generally Earl Grey).
So really, where do I go from here? What do I need to get/do?
I have a gym membership... that I've never used.