Moving from an idea to even getting $1 of profit is possibly one of the hardest things in life. The vast, vast majority will fail miserably. You have to really want it and be willing to put up 100% of your money, posessions, and time for years. Are you willing to do so? If yes, keep reading. If no, your idea will die with you as an idea like the vast majority of ideas die.
When I was ~8 years old I had the idea of a digital camera. Does that mean I get any credit or any profit? No. At the time I didn't have the knowledge or ability to pursue that dream. Luckilly, as I got older I had other ideas and even more luckilly I had the chance to develop the idea, get funding for the idea, patent the idea, and now the idea is being sold. The difference: I was now in a position to put in many hours a day and many tens of thousands of my own dollars into the idea.
The first thing you need to do is to download a non-disclosure agreement (NDA). An NDA is an agreement with another person or company stating that they won't use or disclose what you tell them to ANYONE else. If they do, then you have the right to sue them for damages. An NDA is free to use and can earn you millions in a lawsuit. That NDA is your main protection at this point in time. With the NDA you can now freely approach people for help (drawings), investments (money to fund the idea), or connections (people who can get you the help or investments). I've signed dozens of NDAs and most people/companies won't blink an eye before signing it. They typically last 3 to 5 years which is plenty of time to get further legal protections.
Trade secrets are your best bet. Did KFC get where it is by having patents? Probably not initially. No, it had a secret blend of 11 herbs and spices. That secret is far more valuable than an expiring patent that tells the world how to make your recipe for fried chicken. An NDA is your key to having a trade secret.
Next you need to get funding. The best way is to put up your own money. Once you have your own skin in the game, others will trust you far, far more. There are other sources of money:
1) Angel investors: generally you get free money and they get a share of your idea. The typical amount of money is small and the share of your idea is fairly small. That will get you off the ground until you can find much bigger sources of money. Think of the TV show "Shark Tank" for examples. Your friends/family could be angel investors. Generally, you'll do best if you can stitch together many small angels rather than getting one angel, but that is quite difficult. For example, selling 10 people 1% of your idea for $10,000 each is better than selling one person 50% of your company for $100,000.
2) Venture capitalists: generally you get millions of dollars to develop the idea and they get the vast majority of your idea. A venture capitalist won't even touch you until you have a working prototype, and usually a few sales. After an angel investor and venture capitalist, you might have 10% ownership left. And that money from the venture capitalists isn't yours, it is money to develop the product. You still don't get a dime yourself until possibly that 10% turns into something.
3) Grants: There are plenty of government (federal and local) grants to develop new ideas. They aren't easy to get. They take months to write and years to get. But, it is an option. Partnering with someone who has sucessfully gotten a grant before will help greatly. Try your local university (with an NDA first).
4) Sell out: it is difficult, but possible to go from company to company selling your idea (have them sign the NDA first). If it is a good idea, someone might just take you up. This is quite slow and frustrating as you'll get many "no" answers. #1 rule: when you sell out, keep a percent of the idea. You don't want to be the person who sells a $1 billion idea for $100,000. No, you want to be the person who sells a $1 billion idea for $50,000 and keeps 3% of all royalites (which would be $30 million of pure profit to you in that case).
Patents are good, but way outside your league. A patent itself may cost $15,000 but it does nothing unless you sue someone for violating your patent. Think $100,000 more needed. If you want worldwide protection, don't bother unless you have $1,000,000 ready. But, you can play the patent game cheaply. Provisional patents are only $300 and last a year. If you can develop your idea and start selling (or at least find a big partner) in less than a year, a $300 provisional patent is a nice way to go. The catch is after 1 year, you lose everything if you don't file a costly patent.