My suggestion would be to start out with 4-5 tools, and add on as the need arises. You can do a lot of carving with the following tools:
12mm 60 degree Vtool
12mm #7 gouge
12mm #3 gouge
6mm #7
6mm #3
My choice for mallet tools is Stubai. Pfeil makes a fine tool for carving basswood, but when you use a mallet and move to harder woods, Stubai really stands out. Check out
http://www.stubaidirect.com.
Good Carving,
Dan Heine