that was advise for owning your car.

you can google any question you have.

I'm pretty sure you can google "I just a 240sx, what should I do first?" and get at least half a dozen write ups going over everything you need to do to your car to get it in good shape, then going over the different things you could/should do to your car to make it better.

want my advise. pick a place on the car to start. Usually the engine.
Make sure it is running 110%.
tune up all the way around. new parts. fresh seals, etc etc etc.
I'll give you a hint, a healthy, clean running KA can run/drive no matter where the dizzy is set at. You could technically dive with the bolts loose because it won't matter where it ends up at. sure it will run better in some places, but the point is, it will still run.
I see a lot of cars that barely run and if the spark timing is off even .5 degrees, the thing won't start.
So get the engine running 100%
then, fix everything else that is broken. Freshen up the A/C so it blows titties cold.
clean up the interior so your mother would be proud
fix all of your broken panels, lights, etc so you don't look like a drifter retard.
Then start going over your suspension. Replace the broken crap. Upgrade while you're at it. Don't just throw a part's catalog at it. Figure out what you are changing and why you are changing it. You'll learn to appreciate the subtle differences if you take your time to do it right. The guys that just throw the SPL catalog at it have no idea what they have done, and most of the time, their car handles worse than when it started.
Then get yourself a nice set of wheels. Personally, I think that stupid offset shit is well, stupid. and that slammed, no clearance crap is retarded as all hell. Hella flush or whatever that crap is called. I have Zero respect for the kids that do that. Having your wheels tilt over just to fit in the wheel wells makes you look like an idiot that can't drive, hit too many curbs, has a broken ass car and is too stupid to fix it.
Then, figure out what you want to do to go faster.
Only retards like loud ass cars. Don't be a retard.
Take your time and build the engine you want. Do it once. Do it right.
Get it all buttoned up. Have a nice engine. Awesome handling. Then enjoy your car.
do minor tweaks to the interior to make it a nicer ride.
And just enjoy it. Don't trash it. don't rice it out. don't drift it. don't do stupid shit.
if you want to do stupid shit, then buy a junk beater car and do your stupid shit to it.

/rant