No US silver dollars are dated 1954, the last was struck in 1935. Check the coin again and post new question.
The date and mint mark are on the the edge of the coin
Nothing
The mint mark by itself isn't worth much. It has to be on a coin. If you do have a 2001 coin with a D mint mark, it's far too new to have any special value unless it's a high-quality uncirculated coin.
$680 to $27,500 depending upon the mint mark and the condition of the coin.
A typical Mint State coin is about $50.00
It depends on the condition of the coin. A poorly conditioned coin is worth about $18. A perfectly conditioned coin is worth about $23,500.
About $40
it depends on how old it is.
A dollar.
19.95
That depends on the mint mark, purity, condition, rarity, age and size of the coin.