Once you start shooting you will see exactly what you need. More towards wide angle (broader landscapes), faster lens (f/2.8 or lower - more $$$ more but higher quality), macro for close-ups.
Look at what imaging software you have - you will need that for sure. There may be some good programs you can get for free but having a camera like this (I have a D5100 too and love it) means before long your going to want to get the images in your computer and really make them best they can be and use a whole other creative part of the process.