Just to add to the previous post which had a lot of good info:
The days off are not "days off", they're blocks of hours off. I say this because sometimes they don't line up with calendar days depending on your RAP period.
Also long call being converted to short call can only happen 4 times a month unless you give them permission to do it more.
Trips can be picked up on "days off" and paid above guarantee but can only be picked up from open time, not pilot to pilot.
If you call in sick on reserve is uses less sick time than I originally thought.. I can't remember how many hours one reserve day is off the top of my head but I suggest looking it up.
For short call you have your RAP (Reserve Availability Period).. 14 hours long.
Weekend reserves will get used much more than weekday reserves.