If you can start out with an advanced program like sony vegas or adobe, do that, but you can do a lot with free programs such as WMM or WLMM/MM.
Just take your time, get quality clips (use the internet to find them. Recommend MP4/AVI because Youtube messes with WMV files), and have a fun time. Hell, maybe even use images first to find a base. I did, all I knew at the time, and still love using images in my current vids which include HQ clips.