First off, welcome to fishing! I see you have started your own site logging your success, great idea. I'm going to offer a few suggestions that I wish I had done at your age instead of just fishing by my gut instincts. But first and foremost, don't let a rough day fishing get you down too much. Consider this, Byron Velvic who's won multiple tournaments only caught 2 keepers yesterday at Table Rock. That's a pro, fishing hard for 8 hours. So don't get discuraged.
Start a fishing log. You kind of already did, but I'm going to make some suggestions on how to help make a log more effective for you. First, you want to find a format that works for you and stay consistent with it. The more information you enter, the more data you can pull from down the road. I would look online at different examles of what people log and find a mix that your willing to keep up with. Some basics I would suggest: Date - Location - Weather - Water Temp - Water Clarity - then keep track of what you caught, what lure, how you worked the lure, etc.
An example may look like this:
DATE: 4/4/14
LOCATION: Lake Wigglymo
WEATHER: 65 degrees, cloudy, light wind. Rained last night and has been near 70 all week.
WATER TEMP: 52
WATER CLARITY: Slightly Stained
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Caught 3 small bass on a white and chartruse spinnerbait slow rolling along the ledge in Possum Holler.
Caught 2 large bass on a jerkbait off the pile of rocks at the mouth of Possom Holler.
Tried: Hulla popper, texas rigged worm, and a buzzbait all with no hits.
The more info you are willing to enter, the better off you are. What happens, over time, is you will begin to pick up on patterns. And that is a key to successful fishing, finding the pattern for that particular day on that particular piece of water. Each place is a bit different, but the more you have to draw from the easier it is to figure out where and with what to fish. You can learn tons by reading about what to fish where, but having your own real world data, of fish that YOU caught on YOUR water is the absolute best info you can get in my opinion.
Good luck, and tight lines!