just got a new hook 7 fish finder with downscan and wanting to be able to try to learn it on some known brushpiles and structures anyone know where some may be to try my new finder out thank you all so much as im new and wanting to find some crappie

I started kayak fishing & I was going to try some crappie fishing in the Yorktown VA area. I think Black crappie seem to be the most abundant which I'm going to plan. I was going to just go with live minnows. Any other suggestions or tips ?