For guidance on creating a physical product business, read through the threads where folks have built physical products--they have real-world experience on doing it.
Depending on the consultant you're getting advice from, if they haven't built a physical product business, they'll only be able to give you general advice (e.g., trust your gut, be persistent, listen to the market), but not specific guidance.
Depending on the consultant you're getting advice from, if they haven't built a physical product business, they'll only be able to give you general advice (e.g., trust your gut, be persistent, listen to the market), but not specific guidance.