I can't ID any of those although the last is a moss. You need to think about the environment you got them from. Generally you wouldn't expect plants from Bulgaria to be suitable for closed terrariums. But there are many microclimates and some plants from those might be suitable, especially mosses.

Unlikely. Most plants do not do well in a closed terrarium for the long term.

Dimitri, your second plant is Geranium lucidum, Doves Foot Cranesbill. It might take the humidity but not the low light and warmth of a terrarium. It's a hardy native species. Top is a Sedum species, a succulent, and also not suitable for a moist environment.