Build me an online platform for in-person course registration

Hello! My name is Juan and I work teaching courses to translators. My business is organizing courses, seminars and conferences, some of them taught by my self, some of them taugh by other speakers I hire. Currently, I use a sort of Google form for registrations, so that I get all the information of the people who would like to attend in a spreadsheet, and then, I email them to send payment information. Then I use the spreadsheet to mark who paid and who attended. Then I copy and paste all that info to my mailing platform to use the data to inform those people about future courses. I would like to have a system so that people complete the registration form, and get payment information according to the payment method chosen (my payment operator is MercadoPago), and the list is automatically updated with payments received, I can export their emails or send all the registrants a message, I can export the list to print it... etc. I'd like to reduce the work load by automatizing the registration and payment process. I currently have a Wordpress site that I am planning to redesign. Ideally, we should be able to upload the system to my donweb hosting. Thanks!