Here is a series of "How To Sculpt" videos on YouTube you might find useful:
http://www.youtube.com/watch?v=d-bor7koo_Q
If the link does not work, search "How to Sculpt Fantasy Miniatures: Part 1" on www.youtube.com
ProCreate Putty
You could try mixing in some ProCreate putty: www.kraftmark.biz
It is similar to Magic Sculpt in that it is slightly water soluable so blending should be easier. Good luck.