Diet and exercise information on the internet are two very dubious areas to sift through. You'll find polarising opinions with varying levels of credibility and all sorts of logical fallacies that sound convincing. So rather than provide you with anything you could find out just by googling, I'd rather suggest you develop your skills in critical thinking and basic scientific evaluation - you don't have to go to too much effort here, just enough to learn how to validate information and spot misinformation.
Thankfully there are a few locations where consistently high quality info is distributed, here are a few you may be interested in:
Examine.com - Quick and easy supplement database. I frequent this site quite a lot.
Strongerbyscience.com - Basic guide on how to perform exercises.
@foundmyfitness - Dr Rhonda Patrick, Ph.D in biomedical science/expert on nutritional health, brain & aging.
@GabrielleMaston - Dietitian & Exercise Physiologist. Masters Public Health. PhD candidate - super obesity.
Precisionnutrition.com - High quality nutritional advice.
All the vest best with your new lifestyle