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Key drawings is one of the ingredients that could provide a lucid movement of the objects. Creating a key drawing needs a balance of mind to susbtantiate the movements and dividing it to other action that will produce the "in- between" frames.
To start the activity, it is good enough to have 5 drawings and mark the core frames that would blend to the other drawings to complete the frames. Remember the more drawings you have the more in- betweens shall be made to adjust with the previous actions and daunt extra movements or giving a full blown movements like anticipation.
The style of drawing is one of the flavor that would attract the optics of the viewer, if you are doing a cartoony or an anime type then let your imagination run wild. Adjust your key drawing, create a pattern of it by using your character or a model. A true art is based on the artists imagination and if you don't possess that kind of thing then use the left side and the right side of your brain.
Movements plus timing could create a dashing animation, put numbers on the movement and mimic the real world, not to apply the realism of the action but to give a thin communication of exaggeration, from there you are doing your own world of animation.
