When your start for the first time, fill your pan with water and place it near the river. then place your bucket and brush next to the pan.
Use your shovel to fill the bucket, dump into the pan and rinse with the brush.
Once you save up enough ore, sell it at the jeweler and buy buckets (2) one for iron and one for gold.
Then once you save up enough for pipes, place pipe out of the river with a shutoff to fill your pan automatically.
Double check your key mapping but once you have an item in hand, you can select R T Y to rotate on the X Y Z axis. Blue shows you where you can place, red is blocked or non placeable.