The letters above the songs are chord symbols. They are not the notes you are playing. They are for your teacher or someone who is accompanying you, so they know what to play.
When there is more than one sharp note in a bar, you only need to write the sharp sign before the first sharp note in that bar. A bar line cancels a sharp sign, so if there are sharps in other bars you will need a sharp sign before the first sharp note of each of those bars. This song contains a half rest in the final bar.
This is a whole note. It lasts for four beats. There is one whole note in one bar of * time.
To play the whole note in the final bar of this song, you will need to use a longer, slower bow stroke.