Many books have been written on the subject. Try your library.
If you desire to have all your body parts in working order, you don't make it at home. The makeup of gun powder can be found in numerous books at the library.
Most likely people have gun in there home for self defense
Reading, acquiring materials and tools, following all local, state and federal laws.
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Find a gun you like, have money to buy, be 18 for a long gun, be 21 for handgun, passs background check, depending on the state, take gun home or wait 3-7 days to take gun home
None. A gun in the home, or anywhere else for that matter, will not shoot you. If you are asking what are the odds of being shot by someone with a gun in your home, that's another question. You will have to be specific in what you are looking for. Is there a gun in the home already? Is it loaded or empty? Is it secured or not secured? Are you asking about being shot accidentally or during a crime in the home?