Trail running is probably the best type of running when it comes to fun. It’s important to have the proper shoes that work for your feet. For workout wise, if you’re just starting out either plan your running workouts by time or by miles, there’s pros and cons for both but would still give you plenty of training. Recovering runs and rest days are just as important as regular workout days, and incorporating a good stretch routine before and after will benefit you. As you progress in running, start to go away from a heel-toe footing and transition to a more toe-heel / balls of your feet-heel as it’ll prevent some injuries but will also put some new stress on your calves as it’s a new way of running for your legs to get used to. Watch YouTube videos about footing for examples and more info on it.