It's part of my job, so my advice would be:

1. You talk with real people, it's way more complex than doing a survey, but you'll get better data. 2. Talk to your customers or ask your potential customers if you don't have them.

3. Don't ask your friends, especially your mum - she'll tell you've got a great product because she loves you.

4. Important thing is to ask open-ended questions that don't suggest the answers. 5. You should see patterns after interviewing about 5-20 people. 6. Then, you use the answers and create a survey that will be statistically significant (about 384 respondents) - there're paid services that let you do that.

That's it.