You need to ask more specific questions in order to get useful responses. "Tell me everything I need to know about cycling" is too broad. Most people don't have time to write big posts in the hope that they'll contain information you find useful. It takes less time to answer specific questions.
Amend Greg's recommendation to "ride more but rest when you need to". That's what I did for the first couple years when I came back to cycling after getting very out of shape. It worked for me.