Learn the market first and then search for the best exchange for you, there are exchanges that is user friendly you can try to play around first with gui. Invest in it right now before it's to late.
this is what we need to do before we decide to invest. watching the market trend to know where the trends wants to go, choose 5 coins for example, analyze one by one until you can find a good coin, make a buy the coin in the exchange but don't go all in because it's too risky, do buy again if you think that the price is good and know how much you need to buy.