start with F
practice E until you are confident that you can hit it every time, then try your F. At first it will sound really bad, it always does, and it will probably take weeks to get e decent F, so only practice it for a few minutes a day, or you may get disheartened. The barre is of course the important bit, and its not necessarily about the pressure placed on the strings either, more to do with the correct positioning.
B is similar, but in the A chord shape. Try B minor first ( in A minor shape) its easier because the fingering is easier. This will give you confidence.
Songs to play? Loads of easy ones on tab websites, though try to learn some theory.