The best way is to dig up some information about that coin. Meaning you have to research all about that coin. The concept is important. Is the new coin will solve something relevant to our present time, specifically on the real world (or the digital world at some point)? Or it is just a copy shitcoin that intends only to raise some money without a future plan? The developers should also be looked into. Do they have any relevant experience to the field of their specified concept? Or just a programmer? These some question will help you in selecting a great ICO.