Crontab -l command working. No other crontab command is working
You need to edit your crontab to make changes. Run
EDITOR=nano crontab -e

to use the nano editor for this. Your (initially empty) crontab will be shown and can be edited (e.g. by adding the line you had in your question). Then press Ctrl-O, Return, Ctrl-X to save the changes and quit the editor.