Sam,
We’re part-time comedians in the making, what can I say… In all seriousness, you bring good questions to the table, I’ll give my feedback on top of what Adam and the others will.
During the early stages of your career, you will be on the lower spectrum of seniority, and that seniority moves constantly. This can depend whether you’re at senior or junior base. For example, Charlotte is a super senior base for American Airlines and wholly-owns, as it’s a highly-desired base. During reserve, you may find yourself getting called in more if you’re not holding a line; however, this can vary depending on scheduling needs.
To add to Adam’s comment about the First Class Medical, they will also do a urine sample. If you’re over 40, you’ll need an EKG. While I don’t suspect any medical conditions to require, getting a baseline EKG may be a good thing and you could monitor yearly results as you progress through the career. This might open your eyes to healthier habits and/or open your eyes to future health concerns, if any arose.
https://medxpress.faa.gov/MedXpress/Disclaimer.aspx
Commuting is on yourself, your responsibility and expected to be there for work. That means, if you need to leave the day before to make it to work, you have to. That’s why commuting is not highly desired, living in base is. However, location wise, the could come at a pretty penny and not be affordable your first year etc. There are things called crash pads, I’ve never been in one, but there are some good ones, some bad ones (as you can imagine). In Chicago, a flight crew uses a hotel agreement as their crash pad - I have never seen it, only those that sign in through a binder for it.
Being an airline pilot is probably the coolest (I’m biased) job out there, maybe other than being an astronaut (but that’s soon). What makes you want to become an airline pilot? It seems aviation isn’t in the family; hence your questions. I worked a 9-5 financial job for three years before taking the leap of faith, and I couldn’t be happier.
Brady