First I ask myself who profit from a certain news, how realistic can be, how can it be part of the real world along with other news (if the big picture does not appear coherent something is wrong/false), secondly I try to trace sources, especially looking for governmental, academical PUBLIC sources. In general I consider no source reliable, but certain things can't be hidden, certain normally escape here and there.
So I follow various media via RSS save articles I think interesting and reason on them looking in my notes/feeds history for link and correlation. Such "manual indexing" is mandatory now, propaganda is too powerful to be contained otherwise...
On finding sources: try to scan for news from various countries then select between those in a language you can read. For instance in many countries there are journals in English, few random examples:
- Helsinki Times
- Korea Herald
- Norway Today
- The Citizens (south Africa)
- Japan Times
- Ekatimerini (Greece)
- B92 (Serbia)
- Astana Times
- Ulambataar Post
- TASS / Moscow Times / Siberian Times (not much updated)
- Der Spiegel International (Germany)
- Bangkok Post
- Jakarta Globe
- South China Morning Post
- Taiwan Times
- Sermitsiaq (Greenland, not much updated)
- LRT (Lithuania)
... Pick some, look for others depending on the language you know, check their quality, quantity of posts and put them in a feedreader, consider scoring, and that's already something. Than look for think tanks from various political areas and countries. Than look to well know geopolitical journals. Collect much and test. Then cleanup until you reach a manageable level of news. Collect them in a timeline, annotate correlation anytime you spot something, look for similar stuff (full-text search) when you add a news. In an year you'll already have a certain mass of news-base to spot trends. The rest is up to you: decide where to look for, decide how to evolve your collection. Enjoy and profit from the new awareness.
You can't know "The Real Truth" but in fuzzy logic you can form a reliable enough vision of the world and with it + experience you'll improve. Do not expect immediate results, like for investments or life choices, but in a small number of years your comprehension of the world likely change and if you select well enough your sources and keep adjusting them you likely been able to spot enough propaganda to filter much of the crap out.