How can I fix my yard?

My neighbor’s yard looks awesome and my yard looks like the Jolly Green Giant threw it up. I’ve got a ton of crab grass, dandelions, clovers and other such nonsense all over my lawn. I’ve got so many weeds, I’m not sure how to tell which parts are the grass anymore. I think I’ve got some bermudagrass in there somewhere.

Does anyone have some suggestions on how I can reclaim my lawn?

I’ve read a couple of primers on lawn care and they say different care is recommended for different climates. I’m in Memphis so it’s pretty darn warm in the summers.