should i get a UV filter or any other particular filters?
You don't need filters for digital. Filters were used by people ho cared about critical color using film. Some people think they need a clear or "UV" filter to "protect" the lens. But protect it from what? A lens hood will do the same thing and will actually improve the image. If you are worried about UV light don't.
I polerizing filter is usfull some times but should be removed when the effect is not wanted because it will seriously degrade the image and dim the view through the finder.
The best think to do is shoot lots of frames. But think first about the final print. What do you want the printed image to look like then use your feet and get the camera to the right spot. The #1 mistake is to be some place, see something and then simply put the camera in front of your face and take a snapshot thinking the camera will record what you see. No it will not. Camera make prints you eye/brain does not. The eye is selective in what it sees without effort but yo must put in some effort to make the camera selective
Quick beginner tips:
1) use your feet to get the camera into the right place such that subject is at the
"right" distance and the background is "correct". There is no way to fix this subject to background relationship later and the camera' automatic mode don't help. the zoom lens can't help either. gotta walk.
2) Remember the "rule of thirds"
3) Look at all four edges of the frame. "stuff" should be either in the fram or out and not left to chance but in or out for a reason you gave at least 1/4 second of thought to.
more advanced, non-beginner tip: Look at the light? either control it or wait till it is right.
Do the above and you will be ahead of 90% of all camera owners. Maybe even 99% The the camera can handle the technical stuff 80% of the time. 20% of the time you can dial in some exposure compensation or over ride the auto focus. But most the new "auto everything" camera get it right or close enough that you can fix it later.
What to buy next" Nothing. Shoot 1,000 frames, edit them, keep the good ones then after these first 1,000 frames think about what you missed, wanted to shoot but could not due to lack of equipment. then buy that lacking equipment. It could be a flash with a sync cord for off-camera flash or a faster lens or an ultra wide angle or studio lighting equipment or a macro lens.... you will not know until after those first 1,000 frames. It is a waste of money to buy equipment that does not contribute to getting those missed shots
One more thing. Read. Read a lot of photo books. Those big picture books of the masters and their work As a new photographer it is OK to try and copy the style of what you see in those books. look at the book section at
http://www.aperture.org