Links
These are some (FREE) useful links for your mission planning convenience
Checks NOTAMS here. I would suggest using the radius search function. This link give you NOTAMS for your local airfield as well as surrounding airfields and center NOTAMS.
An important site to check to stay clear of any Temporary Flight Restrictions (TFRs)
Another free resource, this FAA site has a number of useful handbooks covering topics from student pilots to instrument flying. Below are a few of the more important ones.
Helicopter Flying Handbook (H-8083-21B)
Pilot's Handbook of Aeronautical Knowledge (PHAK)
Instrument Procedures Handbook
Plane Sense - General Aviation Information
Aeronautical Information Manual
Designated pilot examiners shall conduct practical tests in compliance with these standards.
Airman Certification Standards (ACS)
FAR Part 61 Certification: Private, Commercial, Inst. Pilots
FAR Part 91 General Operating and Flight Rules