Demonology in general lines is working with Demons; it's also "fighting them" in meaning know what to do when you're in trouble with them. The basics for Demonology are the basics that are used in every (or almost every) magick practise.
Solomon has written a book. I don't know much about him, but people claim God has talked to him. It is claimed he bound 72 Demons on a ring, from many different types.. Solomon has made a grimorie, in this grimorie his way of summoning Demons through cirlces, and the information given about all 72 Demons (they're not all true, be carefull; which is called "The Goetia" or something like that.
That depends on the Demon. If you mean move objects and such then yes, it's possible. Strong Demons are also able to affect weather. If you mean something like whole houses and such, then no. Don't forget they're non-physical entities.