Honestly, if you want an ICO to succeed (and we're assuming here that you can pass some basic vetting and have a viable product), the best possible boost you can get from a pre-ICO marketing standpoint is to get on board with cofound.it. Every single ICO they've promoted on their platform has sold out thus far. Simply being associated with CFI guarantees access to 1) a huge pool of eager, sophisticated investors, 2) a professional team of experienced industry experts who have done this many, many times.
To get on board with Cofound.it you need to already have built community. They have inside investors yes, but this is approx 10% of investment and they take you up to 10% of the company. All of the important things you need to do by yourself. (build community, whitepaper, legal, smart contract, server security...).