Hi, you can learn the details of the project:
-How Many characters must be animated?
-Some characters complexity (number of major bone of extra bones)?
-In what format you want to get the final files?
-What program you prefer to animation was made?
-Rigging and Skinning are set?
-How long to work?
While little information about the problem and it is impossible to determine anything more specific.
Other details are interesting, but not so important to work with, and we can discuss later, if desired.