BKE,
The best way to learn IMO is to go with some other turkey hunters on a hunt or two. If you do not know any experienced hunters personally, then the solo route can be tough. I see you are from Ga, do you know of this website? http://forum.gon.com/forumdisplay.php?f=12 If I were you I would go on there and introduce myself a new turkey looking for some veterans to assist you. There is a lot of good guys on that site and I bet you will find one close to your town who would be willing to hunt with you. If you have doubts about showing a stranger your track of land find a some public property nearby first and see if you can find anyone to help you out on the public land, but if you think you can trust them offer them to assist you on your private land with the possibilty of a double.

If you just want to go solo then get some videos. I like Primos "the Truth" as it does have some instructional stuff on there. If you have the "outdoorchannel" set the DVR there are a lot of turkeys shows on right now.

Now to answer some of your questions, As far as finding there roost I also do what homer said about finding them in the evening. They like to roost around creeks, rivers, swamps if you have any of these areas. As for calling to them while they are in a tree, most guys will use a tree yelp which is like a yelp but quiter, less excited. Then once they hit the ground the yelps start to pick up with volume and excitement. Now as for the walking and stalking. This is just my opinion what the average turkey hunters does. Set up about 80-100 yards from a roosted gobbler. Once first light hits do a few soft yelps to let other know you are there. Birds fly down, reals hens and yourself start calling. If your good and/or lucky the tom comes your way...Most likely he gets with the other hens. You then try to call a little more excited, and copy the cadence of the boss hen hopefully you can piss her offand she will come in, the tom will follow. If this fails and you hear all the noise going the other way, you can try to stalk around them and get in front of where you think they are headingthen start more light calling. If they dodge you or bust you, eventually the hen will leave the Tom's to nest, eat or whatever those women do, This is typically around lunch time. Now is a good time to start calling again, if that Tom is still close and thinks you are the same crazy hen from earlier he may come in totally silent, so you just have to have confidence. Once again if you are lucky he will gooble at you. Wait 3-5 minutes and call again, if he answers is he further away? same place? or closer? Then you have to decide if you need to circle again, wait silently while scatching leaves, or keep calling. There is no correct answer here, each can react different on a given day. So you try all methods until you get him, spook him, or loose him. If your still birdless you can relocate and try to find a different gobbler, or just chill and take a nap! Now its time to atleast find more birds and see we they roost so you can back out in the AM and try it all again, learning from your previous hunt.

Sorry for the long post... Just trying to be helpful. If you want to come up to MI I would be more than happy to show you what I know!