Hello,
I am planning a concrete porch for the rear of my home, 8 feet long x 6 feet by 40 inches tall. The plan is to pour a 16" wide footing to grade, build the walls with hollow block and brick veneer, fill with clean fill and pour a slab on top. My question is do I need the footing along the house wall also or just on three sides and does the slab need any sort of support in the center besides rebar?

OK lets start by determining if you have a frost line, doubtful but got to ask. How deep does your county or city require for footings? " fill with clean fill " nope, not going to happen. You can not pour a slab on clean fill even if you tamp it. You need to fill your cavity with gravel and then tamp and pour. No footing by the house but rebar for a slap is needed as well as expansion cuts which will kep the soon to happen cracks in a line.

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My question is do I need the footing along the house wall also or just on three sides and does the slab need any sort of support in the center besides rebar

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What the plan her for the rebar spacing and size?

The other problem is if you have to dig below grade for any feet a 16" wide footer won't cut it. Can't walk in the ditch to lay the block.
Need 24" min footer width to work in footer ditch properly.

You MUST get below frost for this to be done properly. Check you code GEO there..

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as well as expansion cuts which will keep the soon to happen cracks in a line.

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I disagree with any cuts in this 6x8 pad...

The pad is designed with a footer system and shouldn't move like that. Expansion against the house would be the ticket here and that's it. It's a fixed deck..

If you are filling the inside 40" depth with crushed stone there will be minuscule tamping if at all.. Over tamping will Blow out the walls. If you were laying 10" block that's takes more beating. 12' block here is max below grade then it jumps to 8" block on that above grade, brick in front of that.

I see 10" block below grade and 6' above grade. Can't tamp a 6" wall 40" high good enough to stop post settling by wall.

No Need to tamp here Fill with 2b clean stone for a form to Crete in. Post settling will occur here no matter what because of the tamping problem. DON'T TAMP...