I think that the key thing is to have a sense of how your idea is adding value. There are many ways that IoT technologies can enable you to do build products. Ensuring that you have something that a customer will pay money for can be quite challenging.
That said, given the pace of progress in IoT these days it is important to get to a proof-of-concept or minimal-viable-product as quickly. This can be created with a variety of different development kits ( hardware, software, mobile etc ) and a cloud platform. It is a good idea to pick a development tool chain that can lead easily to a final product. For example, Arduino while ubiquitous and easy to use, does not necessarily lead to a final performance and cost optimized product.
