Following are some basic tips and steps I take to animate stick figures on RMD.
First you have to begin with his legs by making 2 lines meeting a the top using the line tool size 4.
Continue by making another line from the legs upwards, it should be long as the legs. To make the hands make another 2 lines meeting at the top of the chest. (It is better to look at the pictures then reading my BLA BLA BLA)
To make the head just place a dot with the pen tool size 6.
This is the structure of a stick figure where there are the joints. (The white dots are the points from where you can make the stick figure move)
These are some examples of the previous step. To make the figure more realistic you can add some objects such as a bazooooooka.
To make it move you have to make the stick figure, then cover it with the fill tool in white with 80% transparency and then make another figure as if it continued moving and BLA BLA BLA.