A pinball machine is simply not a "plug-and-play" forever game. There are a ton of moving parts, and the object of the game is to wing a steel ball bearing around at plastic and metal objects at 60 mph+ speeds. Things ARE going to break and need maintenance. There is no predicting how long or how many plays it will take. My advice to you and to anyone else getting into the hobby is that unless you have very deep pockets to hire a technician often, learn to do at least the basic maintenance and repairs yourself. It can be intimidating at first (especially since you started with new and complex machines...no easing into it with you! 
), but taken one small step at a time with our guidance, you can do anything needed.
I'll try to help narrow down the specifics you mentioned.
Switches rarely "go bad". They may need adjusting from time to time, even possibly right out of the box brand new. That's pretty easy to do. Some types of switches may need to have their contacts cleaned from time to time, but on such new machines it will be a very, very long time before they should need that. Other than that a wire could fall off at some point from all the vibrations, but that's about the easiest soldering job you could encounter. Really not a lot to go wrong with switches.
Coils very rarely go bad. Again, a wire could fall off. If something wacky happens like a short, or something going back on the circuit board, a coil could lock on and fry. You will most likely never have to deal with that, but if you do they are pretty easy to replace.
Bulbs are bulbs. They burn out. You replace them just like the lights in your bathroom. Super cheap, super easy. Sometimes they are hard to get to, but that's about the biggest challenge with them. When you change them, some people like LEDs, some don't. That is a whole bunch of different threads!
You will want to keep your playfield clean and waxed, just like a car, to keep it in the best condition. Rubber rings will need to be replaced from time to time when they get dirty (though they can be cleaned if they are still nice) or start to lose their bounce. Many people like to swap black rubber for white which will help your playfield stay much cleaner. You should also change balls when they get dirty and old or if you notice any nicks or anything on them. This stuff doesn't need to be done terribly often in normal home use...when you notice the machine start to get dirty that means it is time. Dirt leads to wear. Wear leads to anger. Anger leads to hate. Hate leads to suffering. Err...sorry...Yoda'd out there for a minute... You also want to keep your flippers working good since they are your connection with the game. You will need to rebuild them, but not that often. Probably hundreds if not thousands of games. You will know it's time when they start feeling weak or give you problems working correctly.
With newer machines like yours, you shouldn't have too many troubles right off the bat, but anything can (and will) happen, and you do need to keep them maintained. There isn't anything this community won't be able to help you through though, so don't be too worried about it!
Welcome to the madness!
Jefferson, NJ
