I don't know what you are looking for as far as iso and apperture, but a couple quick things about them:
1) Lower iso's provide less noise than higher iso's, but obviously do not provide as much light. Each camera is different as far as how high of an iso you can shoot
at and still get images without quality reduction and lots of noise. Usually there is a compromise that has to be made for both iso and shutter speed to achieve
both sharp images without being overly noisy and having enough light to capture everything in the photo you wish.
2) As far as aperture goes, for landscape photos such as your bridge there, a smaller aperture is very important for a getting everything sharp and in-focus. There
is a sweet spot on every camera for this, but one thing though, you do not have to, and should not be all the way as small as your camera will go. This will actually
cause the image to be softer. Somewhere between f/8-f/11 usually works good. For images that you wish to have a very shallow depth of field, you need to be at a
much wider aperture, f/2.8 or so.
3) Another thing as far as landscapes go and getting everything into focus, is learning about hyperfocal distance. Google it. There are so many variable things that are involved
with iso, shutter speed and aperture that you could never tell someone everything in this setting. I am still learning myself. It is a long, but fun process. read as much as you
can and experiment as much as possible.