We've got this raised area at the top of the garden which has been a jungle foe the last couple of years. It's now been cleared and we want to put a shed up there (metal or plastic, no wood shit). I had to take down the small wall that bordered it (was a single line of blocks, 1x2m roughly) and am intending to re-use them to build the wall, but to do it properly this time. There were no foundations before (the blocks were placed on some hidden paving slabs) so going to do that, hopefully well, then chisel off the old mortar and re-build the wall.

Anyone had similar experience? I know I'll need sand, mortar, cement, ballast etc and a level but not sure if there is something obvious I've missed.