Congratulations on 'getting the itch' - good for you!
You mentioned weddings, portraits, and then landscapes.
Based on what focal range you already have covered and that you want to shoot weddings, portraits, and landscapes, here is my opinion for lenses:
Great for weddings and landscapes 16-35 -
http://amzn.to/K2VcP2Great for weddings and portraits 70-200 -
http://amzn.to/K2V2qNThe ultimate portrait lens IMO 85 - great for weddings and portraits -
http://amzn.to/JlEM4bAlso consider
http://amzn.to/L2BS5C (17-40) instead of the 16-35.
My favorite lens right now is the Zeiss 50:
http://amzn.to/JvlU7IPS.
Here are some great books as well in the wedding and portrait fields. I highly recommend all of them.
Fine Art Wedding Photography -
http://amzn.to/JytQ9RVisionMongers -
http://amzn.to/KhUGMTPeople Pictures -
http://amzn.to/KCA2vjPicture Perfect Practice -
http://amzn.to/IrI6gf-MS