I would suggest you immediately pick up a decent set of "clear protection" or "digital clear protection" filters to protect the glass on the lenses. This is probably the most important item you can buy after the main purchase. Put them on as soon as you open the lens boxes up.
Also, after shooting landscapes for a bit, pick up a Polarizing and Neutral Density filter...remember you get what you pay for with effect filters. I use Hoya or Heliopan.
Congrads and look forward to seeing your work.