Yes... I may be wrong about this, but I believe Delaware is one of the states where you must be a resident of that state to buy a firearm from there, although I could be wrong about that.
No
No, you do not need a licence in Florida in order to buy a rifle.
Yes.
You simply need to be 18 or older, be able to pass an NICS background check, have valid identification, and be a resident of Florida or a state which a Florida gun shop can sell a firearm to.
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No.
Only if you're a Florida resident.
Yes the background check for guns is the same in every state
Yes- but only from a dealer. You may not buy a firearm from a private seller in ANY state other than your own.
If you are a resident of Virginia, and not prohibited from owning a gun, you may buy a gun from any other resident of Virginia. This applies in MOST states. If you are not a resident of Virginia, then you may buy a rifle or shotgun from a Virginia dealer, but not a private citizen. This is addressed in Federal law- US Code 18.922
A resident of one state may buy a rifle or shotgun from a licensed dealer in another state IF his home state approves such a purchase (Kentucky will). You may not buy from a private citizen, dealer only, and you cannot buy a handgun in another state.