A quote from Robin Sharma goes, "Dream Big. Start Small. Act Now". It is powerful in that an idea is worthless without execution and it all starts with action.
Have an idea? Dream big. Think about the big picture. What it could be. This will fuel your passion and energy. Then, immediately think about the small things you can begin doing now to put that dream into action.
Now, get going. Buy the domain. Make a prototype. Get going......
Too many people focus too long on the big things and not on the small things. The every day small things that move things forward. The base hits. Start with the base hits.