to the OP:

First off, congrats and welcome to Delta.

Go slow. Learn a few things every day, and enjoy the process. Soak it in. It's a lot of fun. Indoc will have its moments of boring, but overall, it's a good experience.

Ask questions. Find the previous airline guys/gals and ask questions. You'll learn a lot. When you get out on line, ask your captains questions as well. Learn from experience. There's a ton of it out there, and the vast majority of us here are happy to teach/impart wisdom.

This company is awesome and the employee group you work with will be MOSTLY great. I used to say at my previous regional that the pilot group was a 20% group (20% A-Holes). Here it's like 2-3%.

Lean on your mentor your first year. They're there to help, and the vast majority of them are good at what they do. If your mentor isn't helping, ask for a new one.

Get involved AFTER you get off probation. There's a ton of opportunities here to help out with various jobs and opportunities.

Do NOT use a ship headset. I got ear infections from using them at the regionals. Invest in a Bose A20 or a David Clark. You won't regret it.

Enjoy it, my friend. Congrats.