The art of stop motion has been a very important part of special effects, developed by Willis O'brien, then perfected by the awesome Ray Harrryhausen. There are tons of stop motion artists on the internet today. I've been making monsters for my movies for three years now, and here's what I learned:
1. The floor of your set, if it has drill holes, must be suspended, so you can drill holes safely. I suggest having it stick off the side of the animation table, held in place by a monkey wrench or clamp.
2. If you need to use a wire armature, make sure the body covering it is very thin, so you can get good movement out of it.
3. Please, if you're making jointed legs, NEVER LET A SINGLE HINGE ON IT BE LOOSE! You need to have it stand up on it's own!
4. Latex dries faster at room tempature.
5. If you want a humanoid face, simply make a crude head shape out of plumber's tape and wire, wrap it in latex, then give it a face made out of plasticine. Although, it's really hard to make fingers or bodies out of plasticine that can last, so I suggest just making the face out of plasticine.
6. If you want a detailed head, but don't have the experience to do it, simply put blobs of glue over the foam head to make a texture, then paint latex on it. It works on hard pieces only, though, such as an upper jaw.
7. Whatever you do, do not let the animation process's problems annoy you! As long as it moves, and the camera isn't too jerky (attach it to a tripod), it will look fine.