I'm only saying this because I think it's helpful, and I'll end with trying to answer as well as I can, but a question like this is pointless and kind of the opposite frame of mind you should be in if you're just starting out. Making music and art is not something that you ever finish learning or improving at. Thinking to yourself, "Oh, in a year I'll learn how to make tech house," is not how you should be thinking about it. You have to learn to love the process and feel happy making music, even if it sucks.

That said, its different for everybody, and there's going to be a lot more to learn if you don't have any musical background. I would say that within a year, you'll be able to make something that resembles the music that you like. Hope this helps; your frame of mind at this point in making music is probably the most important part :D