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/K2VcP2
Great for weddings and portraits 70-200 - http://amzn.to/K2V2qN
The ultimate portrait lens IMO 85 - great for weddings and portraits - http://amzn.to/JlEM4b
Also consider http://amzn.to/L2BS5C
(17-40) instead of the 16-35.
My favorite lens right now is the Zeiss 50: http://amzn.to/JvlU7I
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/JytQ9R
VisionMongers - http://amzn.to/KhUGMT
People Pictures - http://amzn.to/KCA2vj
Picture Perfect Practice - http://amzn.to/IrI6gf