Thanks for asking for feedback. I'm glad I was referred to this message board and your post. Here is your first feedback.

You've posted one of my designs with absolutely no visible (to my immediate knowledge) attribution. You're also selling it, again without permission.

So, good on you for starting a new venture. However, you're ethics are devoid of, ethics.

It's probably impossible to do anything besides ask that you not steal other people's work for your own gain. But if you feel like representing the 3D Printing community, I hope you'll do the right thing and only sell objects that you A: design yourself B: at LEAST attribute the real original designer and C: notify visitors, buyers and original creators that you're indeed selling, redistributing or remixing someone else's work.