if you are not familiar with Skydemon, you should download a trial version; It runs on PC, iPhone, Android phone/tablet and IPad. There are instructional videos on their website to get started. You can switch between VFR charting and IFR/airways.
You see a plan view of the route, and a vertical view of the altitudes flown, base and tops of airspace etc. Even during the planning stage it will highlight potential problems, Notams, etc.