I need help supporting and jacking up my attached, wood front porch
Without awaiting the rest of your pictures, I'll note that if you are removing the decking you're a hop, skip, and a jump from removing the whole porch (or at least the lower frame) which might make it a lot easier to work on. Temporary roof support during porch work is often done with 2x10's angled out into the lawn beyond the porch. Image Search for "porch roof support" if you are not familiar with the concept.