Not sure how to tie all the functionality together

Hi there
I am confident I can write functions in Julia ( thanks to the wonderful book ( the julia language handbook by George Root) but I am NOT confident I know how to tie all the functions together in the same manner I would a python program. Normally I would set up a cronjob which runs a script that has a

def main():
   # read csv from source curl ""

if __name__ == "__main__":

which would act as the startup script thus the controller. Can someone point me at any example that shows a recommended approach to this using julia please?
thank you