Based on your original post, I thought you might have been further along with resources, but this makes me wonder a bit, so I'll add some materials for you. Start here: https://boffosocko.com/2024/10/24/learning-typewriter-maintenance-and-repair
Repair manuals:
- https://typewriterdatabase.com/manuals.php
- Munk's Printed manuals: http://www.thebookpatch.com/BookStoreResults?search=Theodore+Munk&ddl=authors
- Munk's .pdf manuals: https://sellfy.com/twdb
- Service Manuals: https://site.xavier.edu/polt/typewriters/tw-manuals.html#servicemanuals
Other resources: https://boffosocko.com/research/typewriter-collection/
Be sure to register for an account on the typewriterdatabase.com as that will give you access to more material and research than a non-logged in user.
There are a few "young" folx out there who have recently done what you're considering, and knowing a few of them may help. Reach out if you feel comfortable doing so:
- Matt Snyder of New England Typewriter (see: https://reddit.com/r/typewriters/comments/1cxjxt5/new_typewriter_shop_coming_fall_2024/)
- Lucas Dul of Typewriter Chicago
- Paul Lundy
- Antony Valoppi
- Trevor Brumfield
- Aaron Therol of Typewriter Connection
- Bob Marshall of Typewriter Muse
- See also: https://writingball.blogspot.com/2024/05/want-to-run-typewriter-shop.html
Consider a trip to QWERTY Fest which is coming up soon.
Good Luck