First, prime your new drywall with PVA (polyvinyl acetate) primer-sealer. The PVA primer soaks into bare drywall and forms a uniform film. This is important because it ensures your top coat of paint will also dry to a smooth and uniform finish. Without the PVA primer, the paint finish will dry rough with poor hide. You can buy this primer at Sherwin Williams, or really any paint store. For paint, I like Sherwin Williams and Benjamin Moore. Use a premium paint, or enamel, from whatever paint brand you choose. From Sherwin Williams, Duration Home, or SuperPaint, are good for latex paint, or Pro Classic acrylic enamel. If you want the walls to be more durable and washable, consider painting them with acrylic enamel. Satin, or semi-gloss, is best for smoothness and washability. From Benjamin Moore, Aura is one of their top-rated paints.