these are all great ideas, and as a beginner you should try as many as you can before you choose the one you like the most. As a beginner myself, I found that buying the best quality heads and hands with the best detail was the way to go...you cant make a purse out of a sow's ear so-to-speak. All of the techniques work on any scale, just remember when you paint eyes and such in anything under 54 mm (1/32 scale and under) unless the soldier or figure is in wide-eyed amazement, you are not going to see much white/blue of the eye...instead, since they are outside, you are going to see more of a squint, which can be replicated by the techniques above (base coat, build it up with dark for shadows, light for highlights). Oils are the way to go, and you will be amazed with the detail that "pops up" Experiment and have fun, and good luck!