I dont' know how to use photoshop

in my opinion, those advertisement photos are 99% PS (depend how much they PS la..that i'm not sure)

but no matter how good you are using PS, if can do everything right while you shot that's will help a lot

eg: get the meter right, composition, etc... it will help a lot if really need to alter using PS/Lightroom/any other...
i try not to use alter my photos too much... for those pro photographer is essential using PS (they need perfect picture because each frame to them is $$) but to me.... i prefer touching it (the photos) as less as possible

for this set, i didn't alter it much using Lightroom (not even curve) as the light is good that day

I just convert it from RAW to JPG using "AUTO" mode.
Btw, when shooting film, you can't alter too much... if do so, when you upload to FB or flickr, the grainy will be too much and sometime...way too much!!