Press space and add armature. You will want to turn on x-ray and x-axis mirror.
Position the armature within model, rotating and scaling if needed.
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Select the armature and in edit mode, extrude armature to fit the body
When you are finished, select the model and apply mirror modifier.
In object mode, select the model and then shift+click the armature. Press Ctrl+p and select parent to armature. You will want to create from bone heat.
Test the model out by switching into pose mode. Return to original poses with ctrl+z after each test. If no further changes need to be made, switch to the animation mode.
Turn on automatic keyframe insertion or insert keyframes after each move with I, and use the correct option for the type of movement, such as rot if a bone was rotated.
Keyframes are inserted each time you rotate a bone on the armature. Create an animation by moving the bones. After each frame, move forward by using the arrows or typing in the frame you want to move to.
Once the animation is finished, it can be rendered and played back.
In object mode, you can press space and add lights if scene too dark.