if you want to organise a scam ICO- just contact Yolobit....
If you want a real one, ask Vitalik.....
Vitalik, maidsafe's Irvine, singular-dtv Zach are happy to answer OP's question.
You need a very special idea, innovative enough to persuade everyone buys your tokens, but this kind of super wise concept is not easy to have, they are all genius projects. So plz know the top tech first, be an experienced in the community, you will have successful ICO.