Thats a pretty big project, lots of concrete. Are you doing it yourself? If not, your contractor should be able to address all your questions.
Bottom line, everything should pitch away from the house. The fill can be dirt and/or rubble but should be compacted. Liquid nails isnt used to attach two foundations.
My concrete porch was built with footers at the depth of the main house foundation and foundation walls, on my porch, were poured concrete at the same time as the basement walls. Rebar in the forms makes the connection.
To retrofit that you would drill holes for rebar into the existing foundation, epoxy in place, and then pour new foundation. Let your concrete guy worry about that. Mixing up that much concrete from bags is near impossible.
have concrete contractor set forms and do the pour(s)
have mason do the brick facing (either veneer or real brick)
re-set any posts, rails, etc.
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