If I were you I would never trade a new coin. Because you can not know its trustworthyness. It is not so hard to find trustable coin, just check top20 in cmc website.
But, I would say trade a new coin but never have you invested in it for a long term purpose.
New coins are even the sweetest and fastest way to make money, every coin that enters an exchange newly seriously has the chances of getting pumped within few weeks, once you can invest in them before the pump, you will be lucky to make huge profit after the pump once you can catch it, though not the safest means but still the surest means of making quick money.
At the same time, when it comes to investing as long term, it is sure not the best way to get engaged in new coins except the project is a very good one that the investor can really vouch for.