There is no one place that you can only find the trustable ICOs, you can try and use some ICO review sites to get an opinion but they can still be wrong. Mostly you just have to scan through all of the ICOs and find the good ones yourself. There are many ways to do this but they all involve around you taking your time to do your own research. With regards to 99% being scams I wouldn't say that is true, while many are scams I would not think it is anywhere near that number, and in fact many that are later labelled as scams are actually projects which are legitimate but are just very poorly executed.