concrete / cement /motar 2 to 4 inches thick to set everything into.
you might try some rebar mesh or chicken wire, even a chain link fence. toss some motar down. then press rebar or chicken wire onto the top, then some more motar down. then your rocks
the rebar mesh or chicken wire, will help reduce large cracks from happening. the problem is trying to keep all the wire / rebar inside the concrete to prevent rusting
if you can fill most of the cracks in, you can reduce chance of mud/dirt getting into cracks and having weeds sprout up here and there.
also try and reduce areas that will "pool water" so during winter, ice doesn't cause additional crack / chipping of areas.
you won't be able to use mutric acid, to clean stuff up as you go about things. so keep some 5 gallon buckets of clean water handy, and then dump some water into a "dirty bucket" for a sponge / old rag. or what not to wipe off any motar you got onto something. as water dirties dump it, and add some more clean water to the dirty bucket.
if ya never messed with concrete / motar i feel for ya, in trying to get the correct water ratio correct. try to avoid adding to much water,
if you don't have generator, but have a cheap 2 bag mixer for conrete/motar. mix the stuff up in the mixer, and then dump into your FEL bucket. and run it down were you need it. then shovel it out from there just make sure once your done for the day, wash bucket out and take a hammer and pop out any dried concrete.