Are these decent beginner skateboards?

Well, some skateboards have different sizes. The one is 8.1 which might be a little big. Those do seem like good starter skateboards to see if you both like it. Alien Workshop and Habitat are the same company, and that's an Alien Workshop company that makes the trucks and bearings. It's not a great complete but seems like a pretty good deal, if the site is reputable.