It will be a real challenge if you are just now starting to train a boxer manners at 1 years old. Usually you start as soon as you get them and they are still a handfull! The key will be consitency and patience...and more patience!!!
You can also register for obedience classes which will help both you and him to learn to understand each other. You can also do a search on this forum for house training there have been quite a few posts on this with lots of ideas. Best of luck.