Becareful with who you share your idea with. Went to a company years ago called 'Advent Product Development' and they claimed to be exactly the company you described you are seeking. Met with their attorneys and this was their process
step 1 was a meeting to see if your idea was worthy,
step 2 was give them money,
step 3 was submit your patent
step 4 was get a manufacture,
step 5 sell
they would do all this for a small percentage of sales fee, they claimed they would audit the manufacture, sales, etc to make sure we were being paid properly.
everything sounded legit, they told me what I wanted to hear, made it sound like we were 'partnering up' on this idea. The had very impressive presentation of our product, which was a medical bandage/devise, specifically designed for you foot. They kept coming back with needing more money, next step fees etc.... before red flags started showing I was already thousands in.
Long story short, I never even received patent pending. They said I could not get approved as they devise was too similar to ones already in existence. I tried to find what devise they were talking about as many of my family members are in the medical field and there was nothing even remotely close. I search online, could not find anything.
I am not so mad about the money, but more upset that I felt scammed. And my idea never got off the ground..... but I wouldnt be surprised if I see it available one day