If this is a physical product that you're talking about, for the prototype, hire a mechanical engineer. I know several which specialize in startups and prototyping.

A quality engineer will not only have experience in the processes your product will need to be prototyped AND mass produced, after you have proved your concept, they will be able to provide you with REAL DFM (Design For Manufacturing), a BOM (Bill of Materials) and a PRD (Product Requirements Document).

In other words, everything you need to contact manufacturers and produce your product. Even if you are planning on licensing your idea or just looking for funding, actually knowing a little about how to make your product will go a long way.

Most mechanical engineers know and can present you to independent electrical engineers and other experts to help bring your idea to life.

This does require an investment but, if you have done your preliminary market research you should have a feel if the benefits are worth the risk.

Before even thinking about a patent, consult an IP lawyer. Just Google some in your area and call for an initial interview. You may be surprised to find that maybe you don't need to worry about a patent right away. I've done some eye opening interviews with IP lawyers on this subject.

Ask them the question, "when am I not ready for a patent?"

Here are a few links to articles I've written on both of these subjects...

https://www.aireplastics.com/first-prototype/

https://www.aireplastics.com/how-to-hire-for-engineering-design/

https://www.aireplastics.com/top-10-before-patenting-invention/

I hope these help!