I would recommend to start here with the following programs which are walking, yoga and strength training all good exercises for hypothroidism. Hope you enjoy the workouts.
https://grokker.com/fitness/cardio/program/walk-strong-low-impact-cardio-with-ellen-barrett/5887e4e30eeec67481fa03fa
https://grokker.com/yoga/beginners/program/everyday-yoga-level-1/5db0890a8ce7ab34f4ad553c
https://grokker.com/fitness/strength-training/program/bodyweight-bootcamp/5cca0dbf7e27173d94fde162
Chris Mohr can you offer Sydnie advise on diet please? Thank you.