Finalising Website with LifterLMS and Wordpress

I have created a wordpress site and added some courses using Lifter LMS. For the payment gateway I have added woocommerce. Both the site, courses and woocommerce have been integrated however before we launch I want to ensure that everything is in working order and that for future reference I have the knowledge of how to edit or change some things. The wordpress theme I am using is Astra and elementor.

As everything is 95% complete, I just require some expertise on the following:

1. I would like to know that after the customer has made a payment how do they access the course
2. For future products that will be physically shipped, I would also like to know the process also
3. I require information on how we add voucher codes
4. For the two courses I have currently uploaded I have workbooks and materials that accompany the course, I would need to have it integrated that as soon as a customer buys the course, they receive the materials to their email immediately
5. On my wordpress site, I would like the admin toolbar at the top when visiting site (as administrator) so I can edit, this does not seem to be working
6. Though the other pages are ok they still require polishing up so I would require someone to go through as a test run to ensure all tabs, sizes are working and linking to the correct places

Thank you