Before getting patent drawings find a qualified engineer or design professional to develop your idea. Get a guarantee of confidentiality and statement of disclosure agreement signed with the designer.
Often a patent is issued and then the patent holder finds that to produce the item he must change the design so much from his patent is no longer valid for the product that he wishes to produce.
It is important that you first have a viable product design that you can produce and that the item will sell. Designs and prototypes should be made. It should be tested and developed to a quality suited for a demanding market.
When you are confident that you have it sufficient developed then proceed with your patent. You can file a provisional application for patent for a small fee but you must file for the patent within 1 year as described on https://www.techtimes.com/articles/249715/20200518/how-inventhelp-gets-new-inventors-onto-the-right-path.htm.
You may need to obtain a patent to sell your idea. Also the time spent developing your idea hasn’t been used on the life of your patent and you should also have fewer revisions.
Manufacturing Your Idea
A limited manufacturing of your idea can be very desirable. It should be an extension of the development and a bridge to the marketing. It cost less to build limited tooling and it is less costly to make revisions.
And if you need to retool you have less to lose. Hopefully the design and development has been thorough and you have few changes to make. But most often when a product has made it to market there are improvements to make.
Starting with limited manufacturing and marketing can be a smart approach. But by being thorough in your design and manufacturing, diligent in the testing, and cautious in your marketing, you may save your product and make it successful as written on https://www.valuewalk.com/2020/05/medical-invention-covid-19/.
When you have a limited market and everything is working you may want to expand on the sales and the manufacturing capacitive. If you choose to license it to a company for manufacturing, or to find companies for marketing, you have data to present. With sales and reorders these companies will have more confident in your product.