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Normally speaking a criminal case will be titled State of _______ v. __________ and a federal criminal case will be titled USA v. _______ . A person/corporation may, under limited circumstances, sue the government or state as well. In which the title would be the same. Also, states and the federal government can sue people or corporations as well. This would also create the same title. Generally speaking, the person seeking the action (plaintiff or prosecutor) will be listed first.

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Could be either. In the majority of cases a US vs. case is civil but if it is from an appeal or a finding in a criminal case it can be criminal. The Feds just do not have that many criminal laws adn in most cases eve ion a FEd court appeals go by the original case name as in State vs. ____________.

Look at the original docket number. usually the letter(s) C or CR come after the first two digits (which are the original year of the case), in criminal cases.

Then why don't you some research on your own

Google criminal vs civil and you will get pages of results and explanations