There is a big difference between having an idea for a product and actually having a product to sell. From the original idea through to the fabrication and marketing of a product, there are going to be a great number of steps involved in creating something that truly has some marketable value.
Even the very best of ideas can be ineffective in practice either through simple oversights in terms of where you market your product or even simply in terms of the product design itself. Even things as simple as the material you use to create your product can make a huge amount of difference to how effective it is as well as how likely it is to offer a good return on the items you sell.
Therefore, before you even begin to consider prototypes you need to be aware who your item is going to be marketed at and which materials are likely to make it cost-effective, practical and attractive. For many items today, plastic is becoming a more appealing option as not only is injection moulding able to form far sleeker and sexier products at a lower cost, but also such products are likely to be hardwearing and even more widely recyclable.
Once you have put in the research, you will need to ensure you get the best product design possible. However, the costs can mount up in terms of finding a company able to design the product for you, then taking it to another company who can create a prototype and so on down the chain. To maximise your profits, finding a company who can offer all services from effective design through to the fabrication and injection moulding itself will see you save a great deal of money as each stage will instantly inform the next instead of meaning that each new company will be almost starting from scratch.
So to make your ideas a reality, make sure you know your audience, choose your material wisely and have the best possible company to undertake every single stage for you.