A book which is an old favourite for most armour/mil. fig./diorama modellers is
Shep Paine's "How to Build Dioramas" (in fact it's even been called the "modeller's bible" before).
Bill Horan's
Military Modelling Masterclass is also an excellent read if you're thinking of leaning toward historical miniatures later - that said, the techniques are pretty universal.
Unfortunately I'm not really a fan of the early Osprey figure modelling titles (such as the one Mark mentioned - personal preference, but I felt they fell short of my needs), but their more recent ones such as
Modelling Waffen-SS Figures by Calvin Tan (my personal favourite) and
Modelling Fallschirmjäger Figures by Jaume Ortiz Forns and Daniel Alfonsea Romero are really great. Don't let the titles fool you, simply because the focus is a particular subject doesn't mean the techniques displayed can't be transposed.
I've not read Bill Chilstrom's book yet, but it's on the "want list". That said, I'd seen some of the material in the early days around on the forums and it looked terrific.
In terms of non-printed material, have a browse through Historicus Forma, Kitmaker's figure modelling site. There are plenty of tips to be had there, as well as some great SBS's both in the forums and features.
HTH
Rudi
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