Invention Idea

I have a really good Invention idea to improve a current product on the market. Im not going to specify what it is, but does anyone know the steps to marketing my product? Should I go to a local patent lawyer and start there? Im in the process of drawing up and specifying all the details of my idea, material, sizes, colors, etc.

There is a company I heard was good named Davison that helps people step by step with their Invention ideas, anyone know.

I've done hours and hours of research online including ebay and checked in the stores for it and it doesn't seem to exist.

START WITH A LAYWER FIRST AND PATENT IT

https://www.inventioncity.com/articles.html