It's really not that hard.
Setting up a Walstad Natural Planted Tank.http://thegab.org/Articles/WalstadTank.html
Step by Step: Setting up a Walstad-Type Natural Planted Tankhttp://thegab.org/Articles/WalstadTankDemo.html
e tenellus is a good foreground plant. Hairgrass may work, but it likes more light. I'm having a little bit of luck with 4 leaf clover, however, I think it too would be happier with more light.
crypts are great for NPTs because they don't require high light and have good root systems, plus you can get some reds without having to have high light. Same with most of the sword plants. kleiner bar swords are nice because they don't get as large as amazon swords and the new leaves are nice and red.
The sagittaria subulata I have grows like a weed. doesn't stay short tho.
Jungle vals do well.
Any number of stem plants will do fine and are good in the beginning.
Also need fast growing floating plants at first like najas grass, hornwort, duckweed, water lettuce, frogbit, etc.