Most of the comments touched on what you need already, but one thing I will add: I don't know if I can advertise other startup accelerators here, but there is

Most of the comments touched on what you need already, but one thing I will add: I don't know if I can advertise other startup accelerators here, but there is at least one startup accelerator that involves companies with manufactured products. I participated in this program, and they work closely with participating companies on this process. The accelerator is also very well connected, which could help with your marketing thing too.