To paraphrase Stephen King, "If you want to write a lot, you need to read a lot."
I think that can apply to just about any creative medium. The more of 'your craft' you consume, the more stuff's gonna rub off on you. Watching a lot of brickfilms always helps me out. Especially if you use the "." and "," keys to cycle frame-by-frame on a YouTube video.
I'd also recommend doing a lot of tests first. Sure, learning on the fly as you make your first film can work out sometimes, it's better to discover your strengths & weaknesses in some tests first, and then build upon them (and work around your flaws) in your films. Entering brickfilming contests can be great for this as well.
For absolute beginner level starters, though, I'd say look up some common animation cycles (like walk cycles) and test those out until you get the hang of it. Then go on from there.
Remember, you're only limited by your imagination!