Just about every question you've asked is explained in the Manual Part II,
Aircraft and Systems.  That's how I answered all my questions.

You can't drop bombs without an add-on program that does that.
I don't know about the re-fuel.
Google TACAN, it can get complicated.
Radar Altitude is your altitude above the ground.

Everything else is the manual.
It's too complicated to re-print the manual in this forum.