I have to agree with mike. I've used this particular book for almost every build .... 1/35 - 1/16.
As far as start a system .... each builder has his/ her own technique. I, personally, tend with build everything up, minus the head and hands (unless they have gloves on). I've found that, again, for me, that its easier to paint everything in substructures. I usually break it down to the body + gear, the head, the helmet, the weapon, and the hands. I don't like painting everthing before assembly b/c of trying to get the colors to match up. And there's always the factor of damaging the painted area during assembly.
However, most of this is discussed in the above book. And this is just my two cents ....
Good luck!