I’ll mostly give advice you won’t find with a quick Google search (CR39, easy to figure).
Same for online stores. Not sure by country. Facebook group often discusses though.
Contacts vs. glasses, personal preference. Though if you wear contacts, how will you do differentials for close-up?
As for normalized, what are you currently doing for close-up? Did you already go through all the first 30 sessions, sorted out close-up distances, all that?
Let me know, always happy to help. (fellow Bavarian origins here)