Help with set up

[Founddory]

50 gal bow front. Put live sand in 35 gal of RO water. Should I put live rock in an how much b4 completing filling?

 

[54seaweed]

lb to lb1/2 per gal is most common practice , I have over 200lbs in my 90g and you wouldn't even know it , mostly depends on what type of rock your using and the type of scape your looking for