I'm not familiar with Starter School, but they e-mailed you and they're asking you to pay them money? The fact that they're reaching out to you means that they

I'm not familiar with Starter School, but they e-mailed you and they're asking you to pay them money? The fact that they're reaching out to you means that they trying to find customers and likely the interview will most likely be a formality, or a way for them to figure out what they can sell you.