What you need Ginger is to convert those 4 frames into a symbol first. Look up into the top bars click Insert, select create new symbol, ok. You'll then be inside of a symbol.
Go back to the scene and copy the four frames of your stickguy walking and paste them inside the symbol.
Now go back to the scene, and create a large frame, size depending on how fast/long you want him walking
Look into your library and find the symbol with the walking stickguy frames and drag it into the large frame.
After that, right click on the large frame and select create motion tween. This'll make your frame blue. Now here is the technical junk.
Scroll your red bar to the front of the frame and and move the symbol to where you want it to be at the start of the scene, then scroll your red bar to the end of the frame and move the symbol where you want it to be at the end of the frame.
Later when you want to get more technical you can actually make transformations and add effects to symbols but for now you should be golden with that.