Turn off flash, turn off focus light...set ISO to 100 or so, and try. You can turn the exposure down to. Take a couple of samples with different settings, then you use the settings you like the most

If you hold the phone as steady as you can, it will be sharper and more detailed. If you take landscape photos I usually find using the camera button to focus and shoot to be great, but when it's a specific object that's not so far away, I point the screen and shoot.
Even though your not a professional photographer, the settings should be easy to learn.