In Stickman, you have 4 ways to render an animation.
"Render Time Line" will render the frames visible in the time line. Use this when checking the output of a small part of an animation. If you got flash rendering installed, you can choose wheither to in avi or flash.
"Render From Beginning" will render from frame 0 to the last visible frame of the time line. Use this button if you are working on a scene and want to check the whole animation. If you got flash rendering installed, you can choose wheither to render in avi or flash.
"Advanced Rendering" provides you with all render options on one window.
"Easy Rendering" shows a more simplified interface for the most common output options.