New seller, use existing S Corp or create a new entity?

I have an existing S corp that I'd like to use to start selling as I test the waters with 1-2 new PL products. The S corp was setup for a consulting business I have. I'm wondering about issues down the road if I want to spin-off the product business into a completely separate entity with new name, tax id, email, bank accounts, etc, but it's easier to start with the S corp because everything is already setup. Anyone have experience/advice with this? Also, what's the best entity type for an FBA business? LLC?