I just use common sense, watch my portion size and focus on trying to eat whole foods, or those with less/little processing.
Exercise is usually 3-4 days a week, walking around an hour. Have recently incorporated stair climbing because after two months walking wasn't getting my heart rate up like I wanted it anymore. Also do weights 2-3 days a week, with some crunches.
Just start slow and you'll soon figure out what works for you. Good luck and welcome!!