This is somewhat of a large answer requirement. However, if you look at the IRB website there is a referees section there that can help. Some of the points to look for are
Is the field appropriate - size, markings, flags, posts.
Is there the correct number of players for each side
Are the teams wearing correct colours differences, accepted clothing and footwear
Is there safety equipment available in the event of incident either to officials or players
Are there competent touch judges - and do they know what the referee will expect of them
Are players aware of what the referee is expecting in certain situations i.e. the front row, safety and binding.
Who are the captains - as only the captain will question a decision - verbal confrontation from a player will be penalised and if necessary the player sent off.
Is the match ball and any replacements accepted according to IRB specification
Does the referee have 2 whistles and an accurate time piece to check timing and do the assistance have back up watches to help the referee
Red/Yellow cards and a pen
Is any body armour worn by any player in the regulated listing
The list goes on
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