Bill,
If I was to have some normal grass planted along the banks before the water comes up would that be sufficient? Or do I need to wait until I get any proper water weeds? Any way to speed up that process? I definitely think it'd be better to do it before any predators are added into the pond. At 70 cents a piece I don't want to throw away a few hundred bucks in wasted shrimp haha.
Small sample size anecdotal information follows:
I gave my pond a year to develop vegetation before I added grass shrimp. I bought 20 of them from the ebay guy.
A year later there were thousands of them swimming in the pond.
Patience is your friend when starting a new pond.