Current Flight Attendants

Hi! Im a student who is studying abroad (for the second time in college). I need your advice. Last time i paid almost $3000 for a plane ticket.

-tips on how to fly abroad for cheaper, and save money.

-If there are any promotions going on for any airline for flights in june.

-if i applied for a credit card with an airline, do i get a discount on the first flight I book with that company

-any other advice