Use 10lbs of live rock and 40lbs of base rock. You can save a fortune and it will not be any different for cycling. the base rock will become "live" in a few weeks and after a few months you wont be able to tell the difference between the live and what was base rock.
I probably have over 500lbs of live rock total and I have only purchased about 35-40lbs of it live. I prefer the base rocks look personally, other than live tonga rock. lol
I would also just go with all new sand, don't reuse someone elses as you will bring nitrates and who knows what else into your tank. Fresh is best.
No need for "live" sand either that the lfs
sells, basic aragonite will do. Steer away from crushed coral as it can trap gunk in itself and lead to parameter issues later on plus smaller gobies will not be able to sift it if you were gonna get any gobies.