Tips for creating a prototype
Prototypes can take many forms - depending on the question you're testing and your level of confidence.
When you are first starting, you want to find out if people want your solution to their problem. A prototype at this stage can be as simple as the idea written on a piece of paper to be discussed in an interview.
As your confidence in your solution grows, you can increase the fidelity of your prototype - this just means putting a bit more time and effort into making it close to the real product.
An MVP - minimum viable product - is the most basic version of your final product you can put out to test in the real world. An MVP is the last step of the Activate stage, so every prototype you do before this needs to be even more simple or basic.
You need to get creative to make prototypes quickly and cheaply.