Any good quality acrylic paint will be fine. I recommend that my students start with Daler Rowney System 3 or W & N Galeria, which are reasonably priced & good quality. Whatever you do, do not use cheap paints you get from discount stores or car boots. I've had so many students bring these into classes and saying they are not getting on with them. They have so many problems with them and start to think it's actually them. It's not. Many of these cheap paints are loaded with all sorts of thinners and additives, they just don't perform correctly. As you get more confident you can at a later date move into professional quality colours. Student colours (like System 3) can still be used with professional colours, no matter what make. Hope I have been of some help.