First off welcome!
As for powerheads I like multiple smaller ones across the back at differing heights as to not blast one area. This sometimes is not possible so if you have one larger on Id place it further away and across the front of the rocks to get some flow without hammering one area. You just have to play with it till you hit the sweetspot.
As for aquascaping look through the great pics on here and see what you like and work with your rock to replicate it. I like lots of caves and overhangs for the fish to swim through but not everyone is into that.
Most importantly have fun and enjoy this hobby it can be very frustrating and rewarding at the same time!
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