How are you creating your sequence? Are you moving from one frame to the next or are you setting up keys and working backward and forward between them?

Determine how many frames your sequence needs first. You stated 10 seconds, so that is 240 frames, give or take. (10 seconds x 24 frames per second, where 24 is the average number of frames in 1 second of animation).

Establish your beginning pose and position in frame 1. Then establish your ending pose and position in frame 240.

This gives you a middle point of 120 for your mid-way pose and position.

Work back and forth at half-way points (ex: frame 60 and frame 180) each way until the animation feels right. You don't have to key every frame since the software will fill in the transitions for you. You should be able to leave gaps between every 10 frames or so, but scrub back and forth to make sure limbs aren't flying around in strange directions cause every software has a tendency to do that sometimes, all depends on the rigging.

Hope that helps give a starting point. Others can help fill you in on the graph editor (I never mess with it). 

(Edited cause I originally said 2400, cause I can't count)

~Shane