Ok so going really cheap, you can get the
nifty fifty which is the 50mm F1.8 for $89.95 its not zoom, but its great for portraits and I used it for a couple of
church pictures too, although you have to stand fairly far back as its not wide.
I am new at this too and have not experimented with many lenses but I did buy the
Sigma AF 70-300 f4-5 APO DG which was just under $200 new, it might not be wide enough for your landscapes, but its suited me so far.
I hope you dont mind the link to my pictures, but when I was looking to buy the sigma lens I really wanted to see pictures to help me decide what to buy, so I gave you the option of seeing some, Im a newb so forgive my attempts
If your going in to a ritz store be wary, I went in to buy a CF card, the lady showed me two, a scan disk and another, she told me the other one was faster and better, I compared the packaging, and although I dont know too much about CF cards, I could tell what she told me was not true, it sould be she was just confused or it could have been a sales pitch...so watch out.