boat wakes that you can hit square on while going slightly down wind are great for learning them on

the wave only needs to be a foot high if that
the head of your sail will probably cop a flogging while doing your first 20-30 attempts at flat water ones, as it will clip the water as you go round. I destroyed the top 2 panels of my older sails while doing my first couple of dozen as they were plain mono panels that were getting crispy. I still clip the water if i point high into wind when launching but i got newer sails now which are all x-ply and are still stretchy enough to take the punnishment.
feels like you conquered the world when you do your first full spin, board and all

keep persevering!