ford escort 1994?

how do i fix my ford escort 1994. the problem i have is that my lights, stereo and my clock all went at the same time along with my central locking. i think it is my fusebox but i dont know how to check it out, any ideas? if i turn on my stereo no sound comes on but my clock also turns on, but if i go to do anythin with either of them or my lights then they all turn off again. please help, its driving me insane