House Training a Year Old Pomeranian?

My Pom is now just over a year old and has not gotten the whole "only go outside" concept yet. He's kept in the kitchen when we're out or whatever. And he pees where he wants. I've read all sorts of articles and followed a bunch of plans and let him out often. I use the special sprays to clean up and the ones that are supposed to discourage peeing in certain places, but nothing has worked. He'll pee right next to his food without care. Sometimes we'll let him out for a few minutes. He uses the toilet and then comes in and pees right on the wall. He also seems to do it right after I clean it up and use the spray to remove the scent which makes me feel like it's a marking thing. It's super annoying and I'm getting tired of it. He's usually good when he's in the living room, but there's been a couple incidents that we caught and stopped right away. We got him at about 12 weeks and the owner said he was house trained, but what she meant was he was allowed to go in and out of the house as he pleased and he always was outside when he went to the toilet.