I have the same camera and use my older minota lenses on it along with the kit lens. For portraits (and dark ride shots) I tend to use a 50mm f1.4. One of my fav walk around lenses is my Minolta 28-85. Prob is it is a bit on the heavy side but I find its worth it. Both can be found on ebay for around $70-$100 (at a quick glance) As for an all around lens I really do tend to stick with the Kit lens for most of my general shooting especially in Dis and carry along the 50mm for dark shooting.
If you are really looking into doing some landscape photography run down to the book store and grab one of the latest magazines dealing with landscape photography to get an idea of what they are shooting with and how they made the shot. (In think the latest has a cover with a wildflower field at sunset) Look for magazines that are more technique than ads

The same with Portraits.
Dont be afraid to reach out to the great photographers on here to ask what the used on certain pics that appeal to you. Lots of great experience.
Also, look at going to a local photography club in your area. They tend to have learing seminars an all type of shooting and how to really get the most out of your camera.
Speaking of that... Read the manual with your camera in your hand and really learn what everything does!
Before you know it you will be taking great shots
I also highly suggest getting Petersons book on Exposure. Barns and Noble,
Amazon about $15-20. It will be a great reference and study guide for you
Best of Luck!