Welcome to the forums. I would do a few things if I were in your shoes:
1. Determine - What you would like to achieve in photography? Landscape, studio/flash, street, sports, travel, etc? Where will you use your photos - web sharing, printing?
2. Determine - What equipment is required to achieve #1. (you'll want to include a computer, storage, and photoshop or lightroom if you don't have one capable of running it)
3. Decide if you have enough $$$ in present or future budgets to purchase #2.
It's a good idea to sit down and go through the exercise before buying. Having an SLR requires a lot of time and money to achieve satisfactory results. For some they reap the benefits. But many might be better served with a "bridge" camera, like a Canon G9, G10, or Panasonic LX3 that is highly capable of great results for much less investment.
That being said, the K10D is a good choice. I happen to have one on ebay right now for a good price (shameless plug) if you decide it fits your needs
As for lenses, it really depends on #1.