Here is the FAA's Instrument Flying Handbook pdf for starters:
http://www.sheppardair.com/download/faa-h-8083-15.pdf
Plus more to choose from:
https://www.faa.gov/regulations_poli...uals/aviation/
I agree with the "better to not learn wrong stuff at home"-warning but a simple PC simulator like x-plane certainly can give you some idea about IFR flying at home. Some certified version is available as well:
https://www.x-plane.com/pro/certified/
Getting familiar with IFR charts and flight planning might be a good task to do at home first.