when in doubt then do nothing. hold your fiat tight.
then whenever you became more confident and saw a good opportunity then invest. and since you said you are new, then it is best if you take things slow. don't jump in. this market of altcoins is heavily manipulated and they are getting dumped left and right. you'll get crushed if you make an unsure decision.

to answer your main question, investing in ETH now is very risky. there is a lot of shit going on with it. and with the ICO bubble burst there will be a lot of dumps and panic sells.