I like to say that there are several "holy crap!!!" firsts in flying, where it's both cool and a bit scary, and you realize that is up to you to follow your training to survive. The first of those is usually your first solo. For me, that was only surpassed by the first time in actual hard IFR conditions. To this day, one of the most amazing and coolest things in flight is popping out of the clouds and seeing a runway right where it's supposed to be!
VOR's are the primary form of en-route navigation. Even with a GPS, much of the time your clearance will be following victor airways defined by VOR's, and there are also VOR approaches into many airports,
As others have pointed out, that horizontal bar is the glideslope indicator. An ILS is combination of a localizer, which is a very sensitive single heading VOR, and a glideslope for vertical guidance.
What no one has mentioned is that the instrument you will use in IFR that you ignore in VFR is the clock or timer! Holding patterns and procedure turns are flown largely by timing standard rate turns, and for many non procession approaches the missed approach point is determined by timing how long it has been since you crossed the final approach fix.
On an IFR flight plan your are following a clearance - that literally means ATC will make sure that a block of airspace around you is cleared of other IFR traffic, and that block of airspace travels with your plane. The only time you will not be communicating to ATC is after they clear you for the approach into an uncontrolled field, when you can turn to the local traffic frequency.
ATC can not terminate your flight plan, but the route you take will be their decision, not yours. For example, I used to fly Duchess County (60 mile north of NYC) to Philly pretty often. Flying IFR added 80 nm to the flight, as ATC would route me due west to Scranton, then directly south, instead of a direct route. They did this to avoid adding to the New York ara traffic load.
The start of your IFR training is much like the start of your VFR training, only under the hood. You start by flying level, maintaining altitude and course, then standard rate turns, 500 FPM descents, then climbing and descending turns. Once you get the basics down you start navigating and then doing approaches and holding patterns.
One thing: the IFR knowledge exam is tougher than the private exam, and covers things you will never see in training, and with any luck, will never see in real life. I think very few pilots in the US have ever had to use non-radar position reporting in the last 20 years!