The very idea of choosing 300-400 pages book on Mandarin Chinese would be highly intimidating. It may not be your style. In such a scenario, you should not fret, as chinese magazine Singapore would be an excellent stepping stone for reading Chinese fluently. It would be especially true for being committed to a novel. However, it may not be appealing to people.
Why do you need to read magazines for learning Chinese? The Chinese magazines would be your best way to keeping up with your Chinese reading skills. It would be helpful in making you learn the language in the right manner.