The second thing. Where is this brilliant idea going to come from? Get started doing something first and better ideas will come. Don't sit around waiting for an epiphany.
what do you think is a best approach for a startup? waiting for a brilliant idea, or starting with a simple idea and then focusing on giving a good experience to your customers?
"On the other hand, there are also companies which started their businesses from brilliant ideas: Microsoft (operating system), IBM (personal computers),"
IBM was around for just a few years prior to the PC:-) It's a good point nonetheless.