1) buy a manual. It'll be money well spent.
2) headlight comes out bytaking off the indicator by releasing the clip you'll see if you look from above between the headlight and indicator and pulling forward. This gives you access to the outside screws. then removing the radiator cover panel in the middle front lets you at the inside screws. then there's the 2 at the top. Try not to let the black bits rotate.
3) loose connection in the lights somewhere.... at least it sounds like it's within the actual light unit, which makes thimgs easier. Could just be the bulb on the way out, mind.
4)wipers and engine noise - don't know;except check all connections you can find for the wipers.
Intermittant electrical probs are hell as they never show up when you're loking for them.....