1/2" in from the edges.
On the wall if you are standing the sheets up, the joint is always on a stud. If you are laying the sheets down, the joint will be at 4 ft. Ceiling you generally go across the joist. Generally in any application, you either join on a board or are going across the boards.
Putting plastic over the stud walls before sheetrock is not recommended. The moisture will be trapped between the sheetrock and plastic and the home will not breathe.
If you are looking for a stud, you could tap (hollow sound means no stud), check for nails in windows or trim (usually nailed to a stud), or use a stud finder.
You can use drywall nails or drywall screws. I prefer the screws.
5/8 sheetrock over a stud wall has a one hour rating.
Wall board screws. They have a course thread and a flat head.
Turn it on. It may have more than one setting, some have a deep scan for plaster walls. It will work on either setting for sheetrock. Put it flat against the wall and slowly move it across. It should start to flash, may have a tone with the light. It will flash faster as you get closer to the stud and should stay on when you are over it.
Yes, the shower neck is threaded into a brass fitting nailed to a wall stud.
You can use drywall nails (ridged) or drywall screws. I am not a drywaller, but have done lots of it and prefer the screws.
If the marks are at 16 inches, 32 inches, 48 inches, etcetera, those are the distances studs in a wall are supposed to be apart, measured from the center of one stud to the center of the next one. Wall studs are the vertical pieces of wood which the sheetrock is nailed to. I think the marks indicate 1/2 meter increments.
The CV joint stud should be tightened to at least 220 ft/lb.
you should use a stud