How do you cook lasagne noodles?
I mainly use freshly made egg pasta and cook two or three sheets at a time. I build the lasagna as I go. So...
Bring water to boil.  Add a couple of tablespoons of salt.  Do not add oil. Drop in a couple of sheets of pasta.  Fresh takes a minute or two.  Remove to a towel on counter top with a spider.  When cool enough to handle, transfer to lasagna pan and add condiments.  Drop a few more sheets of pasta into water and continue layering.  Then bake.

For dry pasta, use a large pot and add all of the pasta.  Salted water...no oil in water.  Cook for a couple of minutes below the package recommendation.  Drain.  You could use a little bit of oil here to keep pasta from sticking together...or refresh in cool water bath.  I would blot dry before layering.  Build your lasagna.  Bake.