Got the Canon 6D any tips?

Got the canon 6D for Christmas! It's my first camera and it came with 28-135mm f/3.5-5.6 lens. I want to go into all types of photography like portraits, street photography, etc. Are these lens good enough for that? I did some research and some people are saying that the 50mm f/1.8 lens are really good too. Should I get those as well? I'm relatively new to photography and any advice would be appreciated.