These totally depends on what my trading strategy for the day was, if I was to catch the news then I stay updated with news outlets and trade the news. If the strategy was to trade the rumors, I try my possible best to follow the rumors usually I use twitter for this. (Example doge cryptocurrency is been rumored to be listed on coinbase soon which is why the price is surging, I'm still trying to figure out how authentic this rumors is and following every development so far).

Do understand this isn't some cheap ads for doge, it has no fundamentals and just want to make some cash off it, don't take my reply as a financial advice, I'm not qualified to give those.

Finally, if I was to trade new exchange listing I stay updated with channels on telegram offering such service. You'll be amazed by the success you can achieve getting this information before most others speculators does.