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LEARN AS YOU GO.
Before you decide exactly which numbers you need, learn about your topic.
Start wherever you want. (Wikipedia, Google, etc. )
Then, move on to:
From every source, look for:
Terms -- how are the issues described? What words are used?
Laws -- what kinds of legislation govern this question?
Interested parties -- in whose interest is it to collect this information? in whose interest is keeping it a secret?
Sources -- where did they get their information, can you get that same info?
IGO's and NGO's
Standards and Technical Info
Academic and other Research Institutions
Assistant Director for Engineering & Physical Sciences Libraries