I just gave away here in the forum a bag of plant trimmings as a RAOK. (random act of kindness) Maybe enough to cover you whole tank, but I didn't remember about you in time.
Take a look at this tanks to get some ideas for a layout.
http://en.iaplc.com/results12/top200vote/
Those rocks, are they meant for aquarium use or are they going to leach chemicals into the water?