Greetings Wheelboy,
I can feel your pain. I am an inventor myself and I started the in same way you are today. I will tell you what did work for me.
First, having a great idea, a concept, or a great solution will get an invention nowhere. Do not get discouraged here. The first thing I did was to build a full-size, functional model of my invention to establish an irrefutable proof of concept. You
need to know in your heart if your invention actually works. If it doesn't, go to the next idea. If it does, then worry about manufacturing, sales, applicability, market absorption, and everything else.
I did not patent any of my inventions before I passed this milestone. Patenting it is not a science, and if you sell your artifact, the new owner will have interest and will be very willing and ready to pay for the patenting process. I never showed my invention to anyone who did not sign beforehand a pretty tight Non-Disclosure, Non-Circumvention, and Confidentiality Agreement, executed by a Notary Public. This is not the best protection, there are still many jackals out there ready to still your brainchild, to include many dishonest lawyers, but this document will establish an official and chronological intellectual claim.
After this, I took my inventions to the industry or the industry suppliers that deal with the nature of my invention, and tested their interest. So far, I have attracted companies such as 3M International, DuPont, Johnson&Johnson, BASF, GE, and other giants. This is good, but they where giants and I was a pigmy. Then, because these clients can see, touch, and test a REAL, WORKING product, they can calculate the size of their own market, and how much money they can make for themselves with YOUR invention. Unfortunately at unavoidably at this point you need a lawyer. Not a patenting lawyer, but a litigation lawyer to help you to get a good, fair deal that protects YOU.
The same deal works for investors. Investors naturally do not care a bit for your invention, they just want to know how much money your artifact will make them, how fast, for how long, and what it is the least they can risk for it. InveStors and InveNtors are from different galaxies. We inve*n*tors are Homo Sapiens, Inve*s*tors (most of them any way) I have been told that are Ferengies.
In the meantime, complete your working prototype while working on the completion of your business plan and business description, market analysis and studies, competitor assessment, marketing plan, operating plan and operating requirements, financial plan, executive summaries, manufacturing strategies, cost analysis, exit strategies, etc. You will need all of these later. Remember that you have a great invention and EVERYTHING else you need to succeed. The only thing you DO NOT have it is some money. You are the only one capable of developing and completing your invention. Investors can not contribute at all with this stage.
Do NOT get loans! They will prove to be your demise, and perhaps the loss of your invention. Make an effort and complete a working prototype. Showing up is 70% of success. A real object is more convincing than a concept. An idea means risk and a solid product means security. It is possible to put an invention in the market with little money, but with great effort. I am not the holder of the right answer or the "Altum Agnitio", but I have sold 3 of my inventions (one of them is a medical devise) so far using this method. I am selling 2 more right now, and I am doing it in the same way. Do not give up, don't quit, and good fortune to you!
Scappa.