It would help a lot if you write each of the equations separately and name them appropriately; e.g.
eq3... etc. Then you can use
NDSolve routine to try and solve the system (along with the boundary/initial conditions).
Also, try formatting your code properly so that the stack-exchange community can help you more easily. From a quick view of the picture above, it seems that Mathematica does not recognize as equations those arguments that you have. Try avoiding the use of subscripts (you can type
f0 instead of $f_0$). Always use parentheses instead of arbitrary symbols (curly brackets etc.), as Sjoerd C. de Vries correctly pointed out in his comment.