Romeo does not sound like a bad dog, he just doesn't know whats right.. he cannot teach himself not to go potty in the house, or chew things up, or bark. Dont even stress, Im sure he can be a good dog with training (as ALL dogs require)! It can actually be easier sometimes to housetrain an adult dog, because they dont have extremely small bladders/fast metabolisms of puppies and they tend to catch on easier

First, a crate is priceless. Get one just big enough so that he can stand without hitting his head, and he can turn around. Start VERY slow with him, use tons of treats, feed him his meals in his crate, and be patient. As far as chewing, be sure to provide him with many (atleast 10) different chewing toys... Kong toys, Nylabones, Greenies, smoked bones, and Rhino toys are great for chewers. If you provide him with tons of toys especially for chewing, and block off his access to your shoes and other non-chewable items, he will learn which is apropriate. If you catch him chewing on something of yours, tell him NO, take it away, and replace it with an apropriate chew toy.

this website has a lot of good advice for training. I also suggest you take your dog to obedience classes for at least 8 weeks.
http://www.ddfl.org/tips.htm

good luck!