W on a Walking Liberty half dollar is the designer's initial (A. A. Weinman). The mint mark location is on the back at roughly the 8:00 position - blank, D, or S.
If you mean a D or S to the left of the eagle close to the rim on the back of the coin it's a mint mark. D is for Denver. S is for San Francisco.
To clear things up, the coin is called a Walking Liberty half. There is a design called Standing Liberty (not "stand up") that was used on quarters at roughly the same time, so that may be what you're thinking of. Also, the W isn't a mint mark, it's the designer's monogram. Please see the Related Question for more.
Her torch signifies ENLIGHTENMENT
The intertwined "A F" under Miss Liberty's neck is the monogram of the designer Anthony de Francisci
The coin should not have a large 'R' on the coin, this has reduced the coins value to the silver in it.
you stand in the crown
Yes.
The term MS-65 is the grade of the coin, which is "Gem Uncirculated" a better than average coin.
NY harbor on Liberty Island
No it stands on Liberty Island.
Liberty Island
Life and Liberty