Well, organic modeling is pretty difficult. But you can go about it in a few ways.
Creating a base mesh then sculpting - Using Mudbox, Zbrush, Modo, Blender
Box Modeling - Using a box and extruding and adding geo and moving verts to get the shape right.
Edge Extrusion - Starting with a single plane and extruding until you get the shape right.
Cylinder Modeling - Using a cylinder and adding geometry and moving points until you get the correct shape.
Generally, you want to use box modeling or edge for the head, then sculpting in detail. And for the body, you can use any one of those techniques. There are some good tutorials on poopinmymouth.com (Ben Mathis's site) Thats for lowpoly stuff. And Blendercookie.com has some good stuff regarding head modeling.
Generally what I do, is start off with a box for the head and add geo and then move around my vertices until I get a good shape and form. Then I start to sculpt it until it looks nice. I generally use the clay brush and draw brush in Blender.
For the body I would usually create a simple base mesh starting off with a 12 sided cylinder for the body and adding loops to put in more definition in certian places, since it's going to be a base mesh you don't want too much detail though. Then I use 8 sided cylinders for the arms and the legs, and again, add loops and then edit the verts to get a little definition and shape. And then, go into it with sculpting tools.
Here are some other tutorials you may find useful
http://www.youtube.com/watch?v=_oBooDfaUL8 - Good box modeling
http://www.arildwiro.com/tutorials/tutorials.html - Tons of good tutorials on subdivision modeling
http://www.youtube.com/watch?v=qXmLScxzJ9E - Really good box modeling head timelapse
http://www.youtube.com/user/ward7299 - Awesome blender tutorials. Mostly character tuts about 20 minutes each
http://poopinmymouth.com/tutorial/tutorial.htm - Best lowpoly tutorials I've ever seen
Hope this helps
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