Leonard

Hi out there
I need some help to grow my first emersed Crypt. The one I'm going to try this time is a Cryptocoryne cordata "Rosanervig", I know it's probably now the best plants to begin with, but I think I will try to do it as no one wanted to buy it.

First, what substrate should I use? My thought is to grow it in a glass vase, that's hopefully no problem.
I do have vermiculite and leca-substrate, do you think it is good to begin with? The plant I have is totally submersed so I need to make it emersed first.
What substrate do you experts recomend to my cordata?

Can I have the standing vase standing in a window with direct sunlight or should I put up some kind "filter" over the window (like a t-shirt or something?) så decrease the light intense?

Please help me, I'm a total newbie at this!