Position a floor jack for changing the oil on my Camry?

I want to change the oil on my 2009 Toyota Camry. I purchased a 3 ton floor jack, but I haven't used one before. I also have some heavy duty jack stands, which I have also never used. Should I position the jack's lifting point behind the front wheels on each side, or is there a way to use a central point to lift the entire front end of the car to allow both jack stands to be positioned at once? And where do the jack stands go once the car is up? I'm afraid of crushing a brake line or something,