You can use a potting soil of some kind, most people use peat or cocopeat,

There are many plants you can use in your viv,
some fast growing climbers with large leafs are Philodendron or Monstera.
But you may also use something with flowers in it like Anthurium or Begonia.

Good European sites with some ideas are:

http://www.bens-jungle.de/en/index.php
http://www.dartfrog.co.uk/plants.html
http://bromelien-westermann.eu
http://www.schwerter-orchideenzucht.de/