The IRB regulation are quite substantive so Ive posted the main IRM site here for you
http://www.irb.com/irbsevens/rules/index.html
Rugby League World Sevens was created in 1988.
Rugby World Cup Sevens was created in 1993.
Premiership Rugby Sevens Series was created in 2010.
Rugby Sevens information can be found on the official Rugby Football Union website. This website provides information on the rules and the key skills required to play the game. To find out about the World Cup statistics one would go to the Official Rugby World Cup site.
Fiji and new Zealand has won the most rugby sevens tournaments
Generally their is 2 types of rugby. Rugby Union (15 Players) and Rugby League (13 players). The rules differ but they remain very similar sports. Rugby Uniuon is also played on a sevens basis accross the world.
New Zealand National Rugby Sevens Tournament was created in 1975.
Wales
no
no but rugby sevens will be in the 2016 olympics in rio
Rugby union, or more specifically, rugby sevens.
Actually there is no difference. Its a name given to the top level of the professional game which indictaes the bast teams in the league which is made up of South Africa, New Zealand & Australia