1. Give each idea a quick title and write them down
2. Write down the following questions:
* Does this solve a problem for me/am I the target audience?
* Am I part of an online/offline community that are also like me and would likely love this idea because it solves a problem?
* Can I easily get 3 paying customers within the next 5 days, because I have easy access to the target audience?
* Is this something I can launch by myself quickly?
There are more stuff you could ask to the list of questions, but basically the idea that has 'Yes' to all of these questions, is the one you should be jumping on right away. Cross away the other ideas that have No's, or try to figure out how to turn it into a Yes. But your time is limited, so don't waste it bouncing around with ideas that aren't a good fit.