I wouldn’t suggest you buying new coins because it’s riskier. Moreover, there are lots of scam projects, and it's hard to find the one with the best potential. It would be better for you to start with the top cryptocurrencies which have proved their effectiveness and won’t disappear from exchanges. I prefer trading coins that are available on reliable exchanges such as CEX (https://cex.io/buy-bitcoins). The number of supported cryptocurrencies is not large but it's enough for beginners.