Batch Set Up (multiple questions)

Hello, A little background, we are creating an online training website for companies trainees to complete online course work before hands on training. We are having a hard time setting up the introduction into the website for batch admins. -I would like company admins to be able to go to the website URL, see a "buy batch" or "registration" tab than from there purchase their course and be able to invite their trainees via email. This would also include the need to pick basic training on one of our 5 trucks, pick amount of users and to choose between being a domestic or international company. Assigning them the course they need and the price they need. I would like to do as little as possible on my end. Can you explain if this can be done and how to set it up. -Going off the first question: Right now the admins can only add users via the CSV upload option. Is there any easier way to add users? Can It be put into the course purchase process when they're signing up? -Going off first question again: I have a base course price for domestic companies and international companies and I would like to charge an add on fee for more than 4 users. How can I base price off of their selection of domestic or international when they are signing up? Can I include that option in a drop down? How do I add a fee if they choose more than 4 users? -Some of our users pay for the training when they buy the trucks. Is there a code we can give them to not have to pay for training when they go to sign up? Ive been looking into the coupon codes on WooCommerce but am wondering if there is any other options. That is it for right now. We are looking into a more automated way to set this all up if you have any other ideas. Thank you for your help.