I make my puppets by starting with the Armature.
I make a Wire armature that has the right strenghth for the height and weight of the model. When I have made all the parts for the armature I (used to) glue the together, now I will use Milliput. After that I start by making the feet on the armature so I can model it when it is stood up. If I am making a human model I will start with the head and that is seperare to the Armature and I can fit that in. After the feet I build up onto the legs which are proberly the easiest part. But if you are Animating the model and the Wire inside the model is too thick for the legs the wire can sometimes break through the plasticine and show itself. After the legs are done I start on the Torso, on that I always start with the stomach or chest. If I will not be moving the top and have the arms seperate I will make the top out of Oven Baked Sculpey and when I am modelling the sculpey I put in wire holes and then there is space for the wire to fit in when the sculpey is dry. Then on the arms I always see where my Arms go down to and make it the same. I then make the 2 hands which are like mittens and then cut out through the plasticine 4 fingers. When I make the head fit in it always fits in where the neck is and I make a hole in the neck and the models neck will be extended to fit in there.
Hope you liked it,
The plasticine I use is Newplast.