What to add? Fermentation temperature control.
It's damned difficult to brew light lager successfully. I hope you're successful!
Use a Pilsner malt extract, the freshest you can find. Order from one of the big online houses like Northern Brewer. Reserve 66 to 75% of the extract for a late addition (I add my late additions at flameout).
Use rice extract, dextrose or white sugar to lighten the body and flavor; no more than 10-15% of the fermentables. Add this late, too.
Use a classic "noble" hops variety like Saaz, Tettnang or Hallertau. Use very little flavor hops (<0.5 ounces in 5 US gallons) and no aroma hops.
Ferment with a lager strain, and pitch a lot of it. Control the temperature of the ferment carefully, keeping it within the strain's parameters. Perform a diacetyl rest. Lager at least two weeks, preferably a month.
Avoid spices. The wood chips were/are used not as a flavoring agent but to clarify the lagering beer. The beer is kept circulating over a bed of flavorless beechwood chips to raise the surface area of the lagerkeller floor, promoting sedimentation. This reduces filter losses in a commercial brewery. You don't need or want to do that.
Buy, read and get 100% buy-in to Greg Noonan's New Brewing Lager Beer. That book is essential for the lager brewer.
Prost!
Bob