any brick layers or masonry guys out there?

I need to make some 5ft wide x 5ft deep step landings for my house

they need to be high (42") so I want to build cinder block walls then pour a slap on top but im not sure the best way to do that.

I plan to fill the cores full of rebar and concrete to lock it all together so should I mortar them together or just use masonry bonding epoxy glue and just glue them together with no mortar gaps in a nearly seamless look?

in addition, I need to know how best do I bond them to the existing concrete slab? should I just use masonry bonding epoxy glue for this bond?

and what should I do (if anything) to pre-plan for railing attachments?

im also looking for tips on the best materials and method to create the steps going up to the landing.

I have poured platforms and slabs before so I am confident I can do whatever is involved even though I have never done any block work before so any advice for a novice with no idea whats involved, is welcome

thanks for any help you can give me guys