You can tell if a team is active by pressing their team name and don't bid if players been on in the last couple of hours to weeks anyways top right corner
Bidding is another way to stock talent, but ill want you there is an unwritten rule to not bid on active teams. If a team isnt active though than go for it
Absolutely man! Seems like you got the whole calling up and down system figured out. You also get 5 Free Agency signings a season so it may be worth a shot to look and see.
By the way to stay in the discord you need a role, I knows its weird, theres currently no admins online to role you so you might wanna try again later; sorry!