Absolutly loads of info on the site already matey - just use the search function and there will be a hundred other threads asking similar questions.
You can add the right click in settings or just use a two finger tap on the touchpad to bring up the equivalent of Linux' right click menu.
Macs are expensive compared to PC's if you look just a t hardware, but then you have build quality, customer service, the Genius Bar, The highquality included software, a top notch OS thats constantly updated, sleek looks etc to factor into the price too.
You will come round to the Mac way of thinking very quickly - especially if you are from a Linux background, so welcome to the family as it where!
p.s. where did you find a girlfriend willing to;
A: give you a computer to spend time on
B: one who buys you a Macbook Pro?