Keep in mind they don't care how much you know about the hobby, or whether you can paint or not, they can teach you that in a week.
They only care about how well you can sell things, and a background in retail or customer service helps.
So hammer down that you're energetic and engaging with people, and can sell almost anything if given the chance.
Also you will be asked to pick a product and sell it to the rep on the phone. DONT pick
GW products, they've heard enough of that and probably dont care, go with something that everyone needs, so it would be an easy sell.
That's all i remember from when I had my phone interview years ago. good luck with it all