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yes
Not necessary, but recommended along with pipe thread compound.
Yes, otherwise you will have leaks
The use of PTFE tape depends on the what you'll be using it for. PVC products dont need as much as what a brass or copper fitting may require
Can you do it - yes. SHOULD you do it - NO. Because brass and galvanized conduit have different electrochemical potentials (go talk to a chemistry teacher if you need an explanation of electrochemical potential) if you place them in direct contact with each other, you will set up a galvanic differential and promote corrosion. If you must connect brass and galvanized conduit, you should use a connector between the two that will isolate them electrically from each other. In essence, you are "insulating" them from each other so that you don't get an electric current between them to promote corrosion. There are special fittings, I believe they are referred to as "dielectric fittings" that are designed to provide this insulation and avoid the problem of galvanic corrosion. The more corrosive the liquid you have in the pipes, the more important it is to use these special fittings. Hard or salty water can particularly problematic.
yes
Yes, but only if it is necessary.
Not necessary, but recommended along with pipe thread compound.
Any pipe dope will work but Teflon tape is a lot cleaner.
no
There are many companies that offer brass fittings. Among them are BrassFittings, AndersonFittings, AlaCop, ThomasNet, Elkhart Products, and ObrienBrassCompany.
Yes all brass object can be recycled.
It's real important to apply your Teflon tape in a clockwise direction which coincidentally is the same way you thread on most of your fittings.. If you apply the tape in an anticlockwise direction it will unravel as you screw on the fitting which will render it useless. To apply , this is what l find the easiest.
Brass fittings can be used underground for water lines; always check your local code office first. They should not be used for gas lines.
No, there will be a galvanic reaction creating corrosion. You are better off using aluminium fittings
Pipe joint compound or Teflon tape
Yes, otherwise you will have leaks