There are some very simple, affordable little drum machines out there that are a blast to just sit and bang around on. It’s a good way to lightly start getting into rhythm and timing. It’s also something that won’t demand a lot of dexterity. It’s an unconventional answer, but it’s also something that can get you rolling on music without needing to read sheet.

Or if guitar seems up your alley but chording seems intimidating, bass guitar is a great intro to that world. You can learn all the fundamentals of guitar, and if it becomes natural for you, switching over to guitar is almost seamless.