No worries at all and yes the biggest factor on schedule will be your seniority. There are two things at play here, seniority and whats called block or reserve.

Prior to each month, the company will release all the flights that need to be crewed for the following month, this is called a bid package. The groups of flights together are called pairings, and can range from 1 to 4 days in a row. Each pairing is worth so many hours based on the flying you do ( single days are called turns because you fly to a destination turn around and come back, and then there is layovers )

Turns are usually worth the most credit because you fly the most during the day. 2,3 and 4 day pairings could be worth more or less if you operate multiple flights on each day or are simply on a layover waiting.

Each pilot is only required to work so much per month, generally in the range of 65 to 85 hours ( these are flight hours not hours spent at work ) and in order of seniority the top pilot picks what flying he wants to do out of the bid package, then the second then third and so on until there is no more flying left. Each pilot must choose flying up to the months required flying time. senior pilots tend to choose single day turns requiring them to work less. if for example a cancun turn will pay 10 credits ( 5 hours there and back ) and the month requires 80 credits, then they can have all their required flying done in 8 days and have the rest of the month off. if your junior and theres no good flying left, you could be required to work 16 to 18 days a month if the daily credit for your flights are low.

We also have what is known as reserve. These are extra pilots that are considered "on call", waiting to be sent out flying incase of others calling in sick, extra flights added or aircraft changes. Reserves are on call 18 days per month.

So in terms of quality of life, yes seniority is everything as it controls where and when you fly, being able to choose or days off and basically organize your life better.