I'd start with digging up the material safety data sheets (MSDS)[1] for all the compounds you're working with, and reading over those.
I'd also search around for books and papers on electronics safety. It's really amazing just how little electricity is required to stop a human heart, if the conditions are right.
The same goes for chemical safety. College level textbooks on these subjects tend to at least give a decent overview of the issues involved, to a more thorough degree than books targeted at a popular audience. But I wouldn't stop there, and would try to find some more specialist literature dealing with safety in particular.
I'd also encourage you to take courses in these subjects, and talk to the professors about your interest in safety. Unfortunately safety is not a very sexy topic, and tends to get glossed over a lot. But you'll still be far better off with guidance from an experienced instructor than trying to go it all on your own.
[1] - https://en.wikipedia.org/wiki/Safety_data_sheet