Yes, I'm just toying with the same idea, not cakes, but inventing. So I'm looking around on reddit for some advice as well. I just ordered a book off Amazon called The Independent Inventors Handbook: http://www.amazon.com/gp/product/0761149473?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
I know next to nothing about all this, but figured some basics might help. If anyone else knows of a good book to take the steps from Idea to the finished product please post.
I've also seen the recent book by Shark Tank's Lori Greiner, Invent It, Sell It: http://www.amazon.com/gp/product/0804176434/ref=s9_simh_gw_g14_i3_r?ie=UTF8&fpl=fresh&pf_rd_m=ATVPDKIKX0DER&pf_rd_s=desktop-5&pf_rd_r=0232EJ9AQ1M9PK3R5JA1&pf_rd_t=36701&pf_rd_p=2437869542&pf_rd_i=desktop
Maybe that will help you as well.