A minor is about a collection of 24 units you have to take in a specific subject field.
As far as I know it shows up on your transcript you get when you graduate , maybe for your faculty it will show up on your offical degree.
Minor is subjective. I mean to say whether it is good or not is whether you are intersted in it and whether it can help you in your career.
The requirements are sack, the noly required are 1x03 and 1xx3 and 6 units must be level 3 and 4 .
http://registrar.mcmaster.ca /CALEN...nt/pg1640.html
Good luck