Lead, rostering agreement is about a thousand pages long so impossible to answer too many questions. But its evolved over about 40 years, it protects the pilots pretty well with some exceptions, 18-30 hour rest periods for example are not nailed down but are punitive (i.e. the system tries to avoid) in our roster system.
10/11 days off each month, random rostering, very unusual to have single days off, standbys are in blocks always at home & only for four hours. I tend to get 4 blocks of 4 days or so a year. Winters are quieter in general, 20 days off in Feb for me. Bidding system works better for some than others, depends how IT competent you are!
Good luck if you are having a go...