Hi Rod
I came into the painting figure side of this hobby only a few years ago, and luckily for me I was able to dive staight into using acrylics, all I can say is if your gonna use them, realy use them! I used to use Humbrols for AFV stuff I did a long time ago, so you can convert. My only advice is:
If you think the paint is mixed thin enough, then add one drip more of water. Because you can always bud up the colour if too thin, but you cant take the colour off without causing problems..
I may not be the best painter, but if there is anything I can help with, just ask
Dave