Ensuring your invention is going to be the best you can possibly make, means you need to take your time and don’t rush. A forced invention is more likely going to be a failure as it most likely won’t consider all aspects of the market.
Presumably you have a full time job and a life, so treat your new idea as a hobby to start with. Don’t even consider quitting your job based on your assumption that you will make millions instantly. Your idea might make millions, but it will almost certainly take a minimum of 6 months until you see any money coming in at all.
Make sure you select the best team to help to bring your idea to life. The more experienced the team, the quicker the process, and the more likely it will be right the first time.
Shop around for the best designers and ensure they know what they are talking about. All designers should offer a free consultation so be sure to take them up on that offer. Review their portfolio to make you feel more comfortable, or even ask the designer what past experience they have. You do not want to pay someone who doesn’t know how to design for manufacture. Conceptual design and design for manufacture are two different things.
Conceptual design shows you how the product will look when it is completed, but won’t necessarily show you how each part works. This is more to give you an idea on how the part will look and feel once it is manufactured.
Manufacture designs are detailed designs of each part which are used to make the tooling of the final product. Every design needs particular attention paid to it with respect to material thickness and any strengthening features. Ideally a designer with any engineering or manufacturing background will be beneficial.
The more advice you can get at this stage is crucial to the success of your invention or idea, so don’t rush!