Here are some helpful tips for People first starting out with Stop Motion.. (these are tips I really wish I had known years ago when I first started)
You need: A camera, a laptop/pc, lighting units (which are important), and tripod
The best way of creating a stop motion today is to use a camera connected directly to the laptop/pc that way you will get a live feed of the camera's view. It's not entirely necessary, but if your serious you should get some sort of stop motion specific software, because you'll have instant playback and other convenient features.
Once you connect your camera up to the computer you can manually set the settings from the computer, you NEVER want to keep your camera on any automatic settings, like auto-white balance or focus, because your camera will automatically re-expose every time you put your hand in the way of the camera to move your figure. It'll save you all the trouble of having light flickering, which brings me to the next thing... Lighting units, You should always set up in a place with either no windows or covered up windows, you don't want natural lighting because if you do use it, it also will cause flickering in your animation from the lighting change in the room for example, the sun going behind some clouds can cause a great change in lighting in little time. So it's a good idea to block out all natural light and use a couple studio lights.
This is something you absolutely need to do... ALWAYS use a TRIPOD! Never try holding the camera or putting on an unbalanced surface, you may not notice the camera wobbling, but you'll sure notice it in your animation. If you have a small webcam that can't be mounted to a tripod, I suggest you stick some clay down on a flat surface and stick the webcam on top, you should get it stuck down pretty well with no movement as long as you're careful not to bump it.
Now getting to the technical aspect of stop motion...
You should have an understanding of FPS, or Frames per Second, (aka Frame Rate) it's the speed of your animation, (for example, 20 FPS would be 20 pictures a second) it's really something you just need to play around with until you're comfortable with a frame rate. I would suggest 15 FPS, It's not too fast, not so slow, it's a good frame rate for brickfilms especially.
It's all about timing in animation and knowing how fast/slow something should move. The best way of figuring out the physics of something is to just look at real life and use it as a reference.
Since this is about Stop Motion I'm going to go ahead and stop here but you should also look up stuff like, the twelve principles of animation, and other animation stuff in general, because when it all comes down to it, whatever the medium of animation, the same animation rules still apply.
Anyway, hope this helped! Keep on Animating!