These guys who have never raced ovals before have a huge disadvantage IMO. Most NASCAR drivers started out on < .5 mile ovals in their teens. Say what you want about "how hard can it be to turn left all the time?" The guys who grew up on short tracks get a lot of practice running in constant traffic for 25+ laps.
He's going straight into the Nationwide Series, which I think is a mistake. Whoever set up Scott Speed's "intro to stock car racing" course did it right. Start out small (ARCA) and work your way up. Of course, what former F1 driver wants to travel with a touring series to exotic locales like Salem (Indiana), Mansfield (Ohio), Berlin (Michigan), and Springfield (Illinois)?
I wish all these guys well, but I'm afraid they're doomed to fail unless they "serve their time" in the much lower series.