First things first. I always file the bases flat so the figures stand up properly. Then line them all up and give them a spray with white enamel. Leave this to dry overnight. Apart from undercoating the figures it also serves to bring out the detail of the figure making it easier to paint.
Brushes come next.
Under no circumstances buy cheap brushes. They are a complete waste of time. Sable hair brushes are the ones to go for. The choice of paints is between the tins of enamel with which we are all familiar or the comparative newcomer, Acrylics. I have to admit a preference for acrylic, it drys quickly, is permanent when dry but is kinder to the brushes because you only need water to give them a clean wash.