If you believe that you have something new, and you want to get a patent, then you need to apply for the patent before disclosing the idea to anybody. This is because the US changed to First To File (FTF) from the previous system of First To Invent (FTI) a few years ago. The rest of the world was FTF long before the US.
It is a good idea to start with a patent search. You can do an informal patent search by yourself. The two main places to start are patft.uspto.gov and patents.google.com. Your search will not have legal standing, but it is free, and many times will tell you that somebody else thought of it first. If you cannot find any previous patents that cover your idea, then you can submit a patent application. The US Patent Office has a page that tells you everything you need to know, including how to prepare your own patent application:
https://www.uspto.gov/patent.
I have had many discussions with several different patent attorneys and, while anybody can write and submit a patent application by themself, it is almost always a bad idea. There are many legal booby traps in a patent application. That said, the low cost path forward is a provisional patent application. It gives you one year to market the invention, seek financing, or show it around before filing the real patent application. During that time, you are allowed to use the term "patent pending" for your invention. The filing fee for a "micro entity" (yourself) is only $70.00 US. The USPTO fee schedule is at:
https://www.uspto.gov/sites/default/files/documents/USPTO fee schedule_current.pdf. A provisional application does not need to cover the legal technicalities, but it absolutely must discuss the necessary technical details necessary to make it work.
If you want to have somebody evaluate it before filing a patent application, have that person sign a non-disclosure agreement first.