Forming concrete entry/porch...
I haved demoed several concrete stoops in the past that were poured right up against the clap-board sheated walls. In one case, a full height aluminum flashing was used behind the concrete and the other was two layers of roofing felt.
I'm enclined to flash the wall with a product like Grace's ice shield, pour concrete and then commence with bricking from the top of the concrete porch. This porch will have a generous overhang, but it seem to me the "wainscoting" of brick should be built with weep holes. Starting the brick on top of the porch will allow a normal "through wall" flashing with the ability to drain out onto the porch (if ever needed).
While I have never seen it, is it prudent to "pin" the concrete pour into the homes foundation?