I asked Is there a particular version of D&D that is easier to convert to 5e? on the main site, seeking advice on converting prior editions to D&D 5e. It has been put on hold as too broad and primarily opinion-based. How can I revise it to make it work with their format?
Cut out the bit looking for recommendations of specific modules. It's too broad, among a whole host of other problems that recommendations generally cause. (See Are Game Recommendation Questions On Topic, Revisited if you want to read more, start following links there if you really want to fall down a hole.)
Once you've done that it's starting to look more approachable. There are only ten or so (depending on how you count) different editions of D&D, after all. And I know experienced site members have done conversions, and have experience with lots of D&D. And are willing (and happy) to write up high-quality answers that look at lots of editions' material. (I'm thinking of How do interpretations of Hit Points vary among D&D editions? which was recently referenced, or What are the big differences between the D&D editions? for example.)
I do think it perhaps necessary to lay out your priorities a bit. Specifically:
- you say you have AD&D experience--any other editions? A little bit about how much you know them could help
- what your desired playstyle focuses on--combat, role-play, exploration, combat-as-war vs. combat-as-sport, many-year campaigns, one-shots, monty-haul vs. edge-of-survival, and all the things I haven't thought of
- then share any experience you do have with converting: which bits did you find enjoyable, which a slog, what're problems that cropped up in your 5e that you didn't foresee, &c.