How can i become a better keyboard player?

As a keys player, I would also recommend lessons (once a week). 

Dayvenkirq wrote: And what if you want to just improvise? I personally found key signatures and fingering exercises (as the minimum requirements for basic improvisation, unless I forgot something else) very useful for learning to play the piano when it came down to sight reading.

From this point on I can only speak as a guitarist, since I'm not good keyboarder (see above). On guitar we learn improvisation by learning the scales, not just playing them up and down but in groups of four, groups of three, or up and down in thirds (e.g. c-e-d-f-e-g-f-a-g-h-a-c-h-d-f-c and back) etc., which makes it easier to use the scale in improvisation for fast runs and things like that without just playing the scale one note after the other. Of course, learning the scales is one thing, the other one is to learn where you can use them, e.g. "would I play d-dorian or d-aeolian over a Dm7 chord?", and how they differ in colour. 
The other main thing we do on guitar is learning to play arpeggios (starting with triads and going up to 7-9-11-13 chords), which tend to sound very nice in a solo too, and make some contrast to just playing scales. Here, too, it's important to know which arpeggios go over which chord(-progression).

I guess that, basically, what sounds good on a guitar will sound fine on a keyboard, too. I can't get into any specific techniques, but those are basics used on probably any instrument.

PyramidMeetsTheEye wrote: school, practise in music there are no short ways

Completely right!

Get a teacher. If you don't have money, get him only for a couple of hours so that he can recommend you some schools and theory books and give you some kind of practise schedule.

In the meantime, learn chords and their inversions. Get used to take the shortest way to the next notes when changing chords in the left hand. Learn scales, and learn which of those correspond to what chord and what key. Try to play freely for yourself, playing some simple chord progressions with the left hand and improvising and trying out scales with your right. Additionally, learn to read music. Go to a sheet music store and ask for a classical school. Usually you can't get it too wrong with that.

I would say don't focus on technique too much if you're a beginner (but take that advice with caution, I would like to hear the opinion of a good keyboarder on that). I have only be playing for two years myself, as piano lessons are compulsery secondary subjects at the conservatory (no matter what your main instrument is), so most average keyboarders I know are people I met there. My experience is that there's much more that I can't play because I can't read it, or can't get it into my mind, or can't focus on both hands, and not much that I couldn't play because it was technically to challenging. Normally you will progress in a natural way, and the technique will develop as the pieces get harder.

school, practise in music there are no short ways  

Seriously learn to read sheet music and translate that to a keyboard. KNOWING your instrument can be as important as playing it. I'm not the best musician all around but my understanding of theory allows me to trick people into thinking I'm super good

Thanks a lot guys.
And any websites or study-guides you guys would recommend?

Take lessons.