If you are not sure of getting the charactures to move, then by all means practice going through all the motions to learn from. But if you have the basics down a good bit. I wouldn't mess with making a little skit without a story.  It don't have to be a deep story. thing of something simple like. A girl walking down the street turns and looks into a store front. A guy walks up to her and pulls a gun. "I don't know what you have in lipsinc, (I have Mimic Pro) but that is important to have so your story will more directly comunicate with the audiance." The guy says your money or you life. A guy comes up behind and hits the bad guy in the head and call the police. meantime he starts up a conversation and the couple walk away and make a date.

Something simple to YOUR liking. There is enough in my short little skit to get camera angles, close ups. Action. One thing that a lot of people overdo, that is not necessary. is they like to do a lot of full body shots of them walking. It is important to be able to make sure the feet don't slide, but if you know how to do that, then you can save yourself a lot of time by not messing with showing the feet just to let people know you know how to do it. It is more important to get up close and personable than to loose that where you are not connected with the people. This connects with the audience much better. All you have to do is look at movies. Most of the good movies have a lot face shots, a lot of half body shots, and the full body shots are left to the dramatic, or captureing the lage scope of a scene for the most part.

You make the most advancements is in putting a story together. It don't have to be long, but it needs to have purpose. The reason for this is you will see things as to why you need to plan ahead for the next scene. that dosen't sound like much but it coordinates your movie to flow better. It is a good practice, and will become automatic after awaile. These are the little things that pop up threw-out every movie that you will learn from. If you put some clips together with movement. You will never be happy with the results, as they don't mean anything. UTube has a ton of clip that are a waist of time to watch a person walking. Nobody care that you can make a person walk. The care if you can capture their minds, by making something that has a little meaning to it.

I'm into storyboarding my scenes. This is done by the big studios, as they have to have everybody on the same page when making a movie. They start designing sets, camera angles, and mood of the shot. When I write a story. I allready have the visual in my head. it that reguard, I don't need a storyboard to get everybody co-ordinated. I know the scene in my mind. But I like to do it because, 

1. I have my setup of all my charatures that will be in the scene. I can set it up in the most dramatic fashion & setting. This may sound like a lot to learn, but you don't learn all this at once. you start learning after  you whatch you 1st movie spot. You see what you did that could be done better. And each movie you do afterward you try to make what you can see that needs to be improved that you never see in moving people around. 2 people walking around for the practice is nothing. 2 people walking to meet and talk to each other has purposeful start.

Their is no such thing as perfect. But their is making something that is very good. Making it the best you can each time is part of that learning Process. After awhile you won't even think of it as wow that is a hard thing to get right. You will think in therms of this is what has to be done, or it won't look correct. You'll then know you've advance another step.

I push making a short movie with some small plot, because I know if you don't, you will be saying the same things again. I'm not making any movies. Hey there are a lot of people how are witers here at Renderosity. Ask them if they have a little Maybe a TV ad that didn't work out well. I'm sure someone will have something they can donate. I'm sure I have something laying around that I wrote that you could use if you need a quick story. A note about my writing. I have dyslexia, so I make a lot of spelling mistakes and gramer errors. But I have a proof reader to clean up for my final large movies. Plus, I write as fast as I can so I don't loose the mood, or the emotion of a scene. 

I really hope you go the quick short story route, as I know you will be 4 times happier with the results, than moving people around.