Reddit mentions of Plastic Paint Palette - 7'' w/10 Paint Wells

Paint: There's no shame in starting out with a nice basic paint set. Liquitex will do just fine. That texture look (impasto) can be done with modeling paste and then painted on top of. He might have fun experimenting with it.

Palette: If you want something disposable, gray palette paper will work with both acrylics and oil paints if he plans on experimenting more later on. Otherwise a sheet of beveled Plexiglass or plastic will work as a palette. (Personally I just use old plastic ice cream lids and plasticware.) If acrylic paint dries on these you can chip it off or heat it with a hairdryer and then peel it off. For the love of everything in this world, do NOT buy him those plastic palettes that have all the goddam paint wells from hell.

Brushes: 3-5 Nice brushes are better than a cheap set of brushes. (IF he's going to take good care of them.) If he's planning on using heavy body acrylics without thinning them out, you'll want the bristles a bit rougher. I would stick with brush sizes between 12-24. Large brushes are your friend. I'd get him a nice flat, angle, and round. If he finds himself favoring a particular type it'll give him insight for buying his next brush. Edit: have one of these brushes be softer. Story here is that variety is the spice of life and he's going to figure out what he likes best.

Canvases: Buy a pack of canvas paper along with 1 pre-gesso'd canvas of whatever size and shape you'd like. Make sure your canvas paper is a decent size (at least 11x14), since he can always cut the paper down.

Easel: Do yourself a favour and don't buy an easel. Let him pick it out if he wants one.