Vice President
The Vice-President does not preside at an impeachment of a President. The Constitution requires that the Chief Justice of the Supreme Court preside over an impeachment trial.
If the PRresident dies the Vice President is next in line. If the Vice President dies also the Secerectary of State takes over.
Upon the incapacity, death, resignation, or removal from office of the President of the United States, the Vice-President takes over to finish out the Presidential term in office. The Speaker of the House is the next in line after the Vice-President. After the Speaker of the House the President pro tempore of the Senate is next in line.
The custodian of the white house.
If a president dies, it is usual for the elected vice president to take over the presidential office for the remaining term of the president.
That is correct. Note that this is a theoretical situation; so far, vice Presidents have always served out the term of any President who either died in office or (in the case of Nixon) resigned. So far we have not gotten to the next in line, the Speaker of the House.
The vice President,Speaker of the house, and the Pro Tempore
I don't believe there is any law that prevents this from happening. He simply cannot be next in line as president, since he has had his two allowable terms. But this alone would make him a less desirable candidate for vice president, since it means that the person next in line will be less familiar with the workings of the office, and the person will be more likely to change over the course of a term.
The Attorney General is next in line after the Sec of Defense.
He presides over the US Senate and votes in the event of tie. He is next in line for the Presidency if the president is incapacitated.
The Vice President.
That depends on the constitution of the country of the president in question and as you have not told us that we can not give you an exact answer. In the US the vice president would take over first.