Also you can issue system commands through JCL as listed bellow:
// job card
// exec card(for example pgm=IEFBR14)
// write your system command here!
but it is not a good idea to issue serially commands which are related to each other and each one should be run after succesfull completion of previous one.
Anyhow you can find some elementry source codes through internet which will give you ability to make delay between command.