Prepare a footing and set a guide-line at the desired height. Pour the concrete (4000 psi) into the footing. Set the block in concrete, top even with guide-line, leaving a joint between blocks. Return and mortar the joints between blocks once the concrete sets properly. Good luck with your project ;-)

Check the following website. The 4"x8"x1/2" pavers in the following pic are theirs: Here is a link that might be useful: Sunshine Pavers

concrete pavers that size are typically cast in place with steel remesh.

You'll want to rent a plate compactor for the base. A hand tamper is fine for tight corners and places where the compactor can't go but unless you're a World's Strongest Man champion you'll have a hard time getting great compaction on that big a walk. Especially using bigger slabs, you don't want voids showing up underneath them or having them move. No need to compact your bedding layer. You want it loose to help level each slab with its neighbors. Just give them a whack with a rubber mallet. I'd run the 3/4 minus 12" wider than the finished walk on both sides, compact it, and spike in paver edge restraint. By creating a fixed edge that the pavers can't move beyond, you make it a little less likely that the pavers will shift within the walk.