You don’t need a gym to get a good workout, some exercises you can do at home/around your neighborhood:
Cardio (aim for 3-4x a week for at least 20-30 min)
- Jump Rope
- Jumping Jacks
- Push ups
Also do home workout videos.
Start by decreasing body fat through cardio and incorporate strength training to tone muscle. There’s no limit for beginners, exercise as much as you can and you’ll build endurance.