[mtufekyapan]

This is a big question which can not be answered without knowing detail about you and your startup ideas. (In my opinion, B2B and B2C startups have totally different structure about idea and validating.)

Today I read a post about it in this link http://www.jasonshen.com/2014/test-your-startup-idea-with-a-...

When you think about your idea, generally tend to think about technology, product, development but generally this doesn't work.

(When Twitter first launch, most of people can't get their Twitter account. A big UX problem!)

(Beginning of something is totally different than already exist business.)

When validate idea, first don't too much focus on validating and speedly generate your prototype business. This business maybe your first sale or your first counseling.

Don't forget needed and optimal is very different. Everybody talks about their optimal but you should focus on your needed strategy.