Beginner Photographer

Hey guys I was wondering if you could help me out with some things. I just recently getting into photography and got a cheap beginner camera, Canon EOS rebel T3. Now I’m just waiting for my SD card to get here before I start to snap photos.

I just have a few questions. Should I buy a UV filter? And if so, what kind (link)? Also what photo editing software should I use since I’m a beginner? I was going to choose between CS5 and lightroom but if there are any others, suggestions would be highly appriciated! Also if there is anything else I should consider buying please suggest all things.