You may have a look at
man crontab # describes the crontab command
man 5 crontab # decribes the syntax of a crontab file
In few words you can schedule a job by populating your own crontab. Use the command crontab -e to edit it and add lines like this:
35 17 * * 3 $HOME/test.sh
in this example the script $HOME/test.sh is executed at 5:35 PM every Wednesday. Good luck!