I am an oil girl, because I love that it doesnt dry right away so you can constantly change it. Not that you cannot change acrylics, but that is just adding more paint, instead of manipulating what's there. I like the texture of oils too.
Boy, however, loves acrylics. He likes that they are light and have brighter colors. He layers a lot, and for white areas, he leaves the canvas to peek through and then adds dimension with more shades of white, but thats a good trick. They are easy to blend, and dry quickly. I suggest starting just like you would with watercolor -- your base, then build up. I can ask him more specifics, and tips perhaps. Have fun!