how to invest in new altcoin ?
What you need to do is mainly make sure that the coin is open source and there isn't a secret way for the developers to get access to new coins that would appear out of thin air, thus making it a scamcoin.
I believe this is what happened with USBcoin in the past. The users basically got scammed by these scumbags.
Anyways, good luck. There are a lot of opportunities that are present in the altcoin world.