As a 5th lvl paladin with oath of the ancients i get misty step

I've already used find steed to have a mount, the PHB has "While mounted on your steed, you can make any spell you cast that targets only you also target your steed."

curious to figure out:

if this is do able

bonus action misty step -> character attack action -> mount attack action

also:

do enemies have attack of opportunity against teleporting (misty step)?

does misty stepping behind an opponent grant advantage?

Thank you in advance

Yes, RAW you can Misty Step with your mount.

Yes, you can take your bonus action before your attack action.

You do not get opportunity attacks against teleport.

Depends on your GM whether he will grant advantage. Generally speaking though, you would not get advantage. There is no longer real facing in D&D anymore.

In addition to what Wysperra said (which is all correct), your mount can't attack if you are controlling it. An intelligent mount can attack, but on its own turn.

See mounted combat rules here: https://www.dndbeyond.com/sources/basic-rules/combat#MountedCombat

Quote from Wysperra >>

Yes, RAW you can Misty Step with your mount.

Yes, you can take your bonus action before your attack action.

You do not get opportunity attacks against teleport.

Depends on your GM whether he will grant advantage. Generally speaking though, you would not get advantage. There is no longer real facing in D&D anymore.