Welcome to the Nikonians, if you have questions you can get them answered somewhere around this site. To answer your question about your lenses, if they are AI or AIS lens they will work on your D800. I have some of the same lenses that you have and they work very well, of course you have to manual focus with them. You just add them to your camera and put in the information and you’re good to go. I use the AF button on the back of the camera to focus as I find it easier than holding the shutter button half way down while focusing.
The D800 is a great camera, enjoy it and have fun.