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With respect, did you read anything on here about XOJET, or refer to the information page at
https://www.airlinepilotcentral.com/...xojet_aviation before posting? The available schedules are clearly laid out.
If you need a flexible schedule with different days off each month, you can bid a Flex Schedule. It is similar to airline bidding and seniority determines if you get what you bid. If you prefer a fixed schedule, you can select from an 8/6 or 15/13. It is fairly easy to swap with someone if you need a particular week off.
If you are sick, you call in sick. You earn sick leave each year which will be used first before any vacation (if you are sick longer than your avail sick leave balance).
I highly encourage you to read the XOJET threads on APC and review the info page. Lots of answers and perspectives that would be perfect for you...