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To make a project repeat, select it and open the inspector. Edit the repeat settings as desired. If you have the project still set to "Don't repeat" the "Next Start" and "Next Due" values will be a grayed-out "None" but that changes as soon as you change "Don't repeat" to "Repeat every", "Start again", or "Due again".

You'll either want to repeat a project or repeat its actions, but not both. If you do repeating actions, you usually need to either use start dates or a repeating action group (with no repeat on the actions, just the group) or a parallel project, because the newly created action when you check off the previous one will get inserted right below the one you checked off.