Someone already did. Did you miss that? With moderate boosts, gains at half way mark or less, 80- HZ on the high pass, and moderate volumes, you are highly unlikely to stress any part of your system to the breaking point. Keep it like that until you've read enough to know what you're doing or found someone to handle the tuning for you. It'll take more time than reading one tip on one thread.
My gains were set using test tones played through my speakers (I now know that's a no-no, I understand why, and I wouldn't recommend it for you but it got mine where they probably need to be). More people here would recommend either a digital voltmeter or an oscilliscope because music is so dynamic, it's difficult to use regular music and detect the point of distortion by ear. I can do it with really dynamic bass for my sub amp but when it comes to looking for distortion in mids and especially highs Ive never been good at it.
After careful experimentation the best x-over settings for my amp in my truck appeared to be about 65 HZ for the front speakers and 80 HZ for the rear to get a good impression of clean bass coming from the front in live performances.
I never touched any boosts on my amp other than to make sure they're at zero. Everything on my head unit is zeroed out except sometimes I cut the treble by about 1.
The goal here is to set everything so you can get the most you can out of it all without anything straining to the point of breaking. Gains is the first thing you should learn about and nobody is going to teach you that in this thread because it's the probably the most frequently asked and addressed topic ever and if you do a search on 'gains' you'll find a ton of useful info. The best you'll probably get if you drop the attitude is people will post links to the most useful tutorials.