Possibly starting first ever small FOWLR SW tank and looking for info

[CGY_Betta_Guy]

What kind of LS should I be looking for and where can I pick it up locally in Calgary? Think I need much to cover the bottom of 6G tank? Should I also think about putting some with LR in my sump and would that require lighting the sump? My sump is basically done so I am starting to look for supplies etc and still need to hunt for some small nice looking chunks of LR. I measured it out last night and I have a total water volume of approx 10G ... maybe slightly less to account for sand, rock and enough space for water to drain to in case of power failure.