[jppope]

The best way is to go talk to people.

Though Tech People hate the concept there is no better way to validate an idea. Why? because people are willing tell you why they don't want to buy you thing or why they do, which lets you develop better products

[abriscallbowker]

Good Advice! Do you have any recommendations for how to gain a grasp of what problem to solve in the first place - how do I know where to begin and what users to speak to?

[jppope]

I'd recommend finding people that are already good at isolating these sorts of problems themselves, they'll either have one queued up for you or show you how to find them.

Be careful about not talking to someone thats too successful though- they are playing a different game and their knowledge probably won't be applicable at lower levels (i.e. don't a formula 1 driver how to parallel park)