Ok, stuff I can actually help you with...
Head lights, yeah, they are odd to being with. What possibly happened is someone wanted to be cool and put colored head lights in there in place of the stock halogen lights.
Driver's side...
1 - Remove the battery.
2 - In the 2nd picture you posted, that small round electrical connector that disappears into all the rubber... Put two fingers on each side of it, then wiggle and pull at the same time until it comes off.
3 - The round thing that you are looking at now around the electrical connector, carefully peal it off around the edges, eventually it will come off.
4 - There is that odd spring looking thing that you should now be looking at, take a picture of it so you can figure out how it is supposed to look when it goes back on, it is a royal pain it go back on but it will. Remove the spring thing and then pull the light bulb out, it is actually quite small.
Passenger side...
1 - Remove the air filter box.
2 - Instructions are the same as above.
There isn't any way to aim them, they are automatically locked in place where they should be once the spring thing has been reinstalled.
Doing 55 around here will get you passed on any day of the week, but seriously, try the mile post thing, you could also have someone else get up to 55 and then see if your car does the same speed according to your speedometer.
Spark plugs...
Suzuki was the first engine I had ever seen that looks as exotic as they do, prior to that everything I worked on was old school distributors. Getting the spark plugs out is actually quite easy, I have the 1.6 which is setup differently than the 1.8, on the 1.8 those four black things on top of the valve cover with the gray electrical connectors are your ignition coils (yes there are four of them) unplug all the gray connectors then unbolt the coils, pull and wiggle them at the same time they should just pop right out. Your spark plugs are at the bottom of the holes, and yes you do not have any spark plug wires :-)
They are in love with the car? So am I, I love this car, my wife eventually wants to get rid of it due to high mileage but I'm like "It still runs fine", so I never plan on getting rid of this car if I can help it.
Hope this helped!