When doing research for your speeches, look for these kinds of resources:
Reputable, mainstream newspaper articles, like those from the New York Times or Washington Post
In-depth news magazine articles, like those from Time or The New Yorker
Credible websites and reports from professional, non-profit, or research organizations; educational resources; or the government, such as the CDC, the UN, or Pew Research
Whenever possible, trace back references or links to the original source. It's better to look at it yourself than to trust somebody else's interpretation.
No source is 100% good or bad, but the indicators on the right can help you decide whether a source is a good choice to use.
Balanced News Aggregators
AllSides is a US news aggregator which lets you compare articles with different political biases covering the same topic.
They provide a quick overview of the political bias of a variety of news outlets.
Put a URL in their bias checker for a quick analysis.