Like Lawrence said, you always want your shutter speed to be two times your frame rate. If you are shooting 24fps, then have your shutter speed set to 50. If 60fps, shutter speed set to 120. You always want your ISO to be as low as possible while still exposing properly. The lower the ISO, the lower the amount of grain. Also as Lawrence said, use those key ISO numbers. They produce the least amount of grain.
Other concepts you are going to want to read up on:
-composition
-depth of field/picking the correct aperture
-white balance
-in camera picture styles
-lighting
-etc, etc, etc
I'd suggest picking up a photography book to learn how best to use your camera. There are millions of possibilites. The best way to learn is to try things. You aren't going to be making baller content right off the bat, that comes with time. You are bound to fuck up. Everyone does. Even the people with top notch content. It is a learning process that never ends. There is always something new to learn.
One last thing... I'd suggest thumbing through the little guide books that came with your camera. I know it can be boring and not seem worthwhile. I'll admit, I skipped over that shit when I got my first DSLR. With time I realized I knew jack shit and turned to the Internet to learn as much as possible. Recently I was put in charge of getting a bunch of camera gear for my employer and when the package came in I decided to look through those little books and I was surprised at just how much information they had and how useful they would have been to me when I was a noob.
Happy shooting!
