That is still awfully vague. There surely is a rough outline of the project, isn't there? The "need" for a blockchain alone just doesn't cut it. There is no such thing as zero transaction fees because if there is work involved in any form there are also costs. If you can't be way more specific and describe in detail what you want to do resp achieve, I'm afraid that nobody can help you.
We have 3 independent applications which can be linked together to an ecosystem and we would start the ICO for the whole ecosystem.
We received some suggestions for choosing one of the following three platforms:
Ethereum (low enough fees, fast transaction and better security), IOTA (free and instant) and Waves (Incredibly fast transactions - verified within seconds, decentralized exchange built into the wallet, low fees).