After you have created questions, you can add those questions to a new Quiz through the question bank.
- Create a Quiz.
- After creating the quiz, click the "Edit questions" link.
- Click the "Question bank" tab.
- Adjust the filters to limit the list of questions.
- Check the box next to the questions you would like to add to the Quiz.
- Click the "Add questions to quiz" button.
The selected questions are now in the Quiz.