Hmmm....u can easily toilet train him. Just buy some really tasty dog treats suitable for pups. Make tiny pieces of the treats & put some in ur pocket before going out with ur pup. Give him one if immediately if he urinates outside. That will encourage him to pee outside as he will realise that doing that he can earn treats.
Apart from this soak a cloth in his urine & put that outside ur house. Take him there after every meal, play session & nap. Let him sniff that cloth. Dogs generally like to pee at a place where they can smell their urine. If he does his job give him a treat immediately.
Also keep a close watch when he is inside the house. If he circles a spot or sniff extensively, immediately rush him to the spot where u have put the soaked cloth. A treat again for peing outside. Always give the treat as soon as he finishes, NOT after coming back home.
Clean ur house thoroughly to remove his urine odour. If he uses a particular spot inside the house then make that area unavailable to him.
Be consistant. he will learn quickly. Hope this help.
Dogs lift their legs to urinate only after they are fully mature. So nothing is wrong with ur pup.