The Question and Answer section for The Waste Land is a great resource to ask questions, find answers, and discuss the novel.
Elliot was a classical modernist. He was like a superman of literature: a poet, essayist, playwright, and critic.....Your question, however, is much too detailed for this short answer forum space. This is more a thesis question.
I presume you are referring to the TS. Elliot poem? Put simply The Waste Land " refers to the spiritual and intellectual decay of the modern world. The land is a barren and dry. Nothing grows from it and decay is a common theme. Link that...
In context, wasteland is what remains of the world after war.... desolation.