mickbobcat, the Theory of Evolution explains how Flora and Fauna evolve over time, so it explains how the plants and animals we see today got here. Nothing more.
If you want to get in to how Life on Earth started, which is one question, or how the Universe we know came in to existence, which is a a separate question, they are NOTHING to do with Evolution.
If you wish to know about those two things you have to study Abiogenesis, and Cosmology.
I also suggest you look at the very solid proof that argues vigorously against the idea of complexity and diversity being proofs of design.