I have 3 Peace Dollars that are 1934S. The coins are somewhat smooth. I am not sure how to grade them... I also have a 1900 Morgan dollar with the "we" very lightly stamped compared to the rest of the coin. How can I find out how much these coins are worth or actually find a reliable buyer?

Jillys - On the 1900 morgan dollar ,There is no difference noted in the 2008 Red Book :: what has happened is that the coin has been worn down ; If you take it to a coin shop you will get the same answer, Sorry, THe value of the coin IN VG-20 is $ 20.00 & in EF-40 is $22.00 ( EF stands for { extra Fine } & VG stands for { VERY GOOD } IF you will go to ( HTT;//WWW.ACOIN.COM ) tHERE IS A sUMMERY OF HOW TO grade A COIN AT DIFFERENT lEVELS. And how to ,by looking at the coin for certain things.
Now for the 1934S silver dollar , You can do the same for gradeing of coins as written above:: AS per THE 2008 RED book ,The fllowing values for the different grades I have posted;; VG-20-$20.00 ;; EF-40-$ 40.00:: AU-50- $ 625.00;; ( NOTE - AU-50 standes for -{ ALMOST UNCIRCULATED } ; MS-60- $ 2,100.00 ; MS-63- $ 4,500.00 ; MS-64- $ 5,800.00 ; MS-65- $ 8,000.00.;; Above AU-50 -- WILL BE ALMOST PERFECT!!
AS to where to sell them - You can get on { E-BAY }, Where you will really get a good value is to advertise them in papers ,{ to collectors, perfered ] Look at the chart on gradeing of coins and go from there as to what to sell them for, Coin collectors will usely pay more for a coin ,most so if they need that coin for compleeting a set. NOTE- also the MINT MARK MAKES A BIG DIFFERENCE< THE { S } MINT MARK IS ALWAYS THE HARDEST MINT MARK TO FIND IN ANY DENOMINATION>!! :: HAVE A VERY GOOD DAY AND GOOD LUCK:: AND GOD BLESS::: F.B.E.

PS I hope I have helped you out F.B.E.