I bought my first Nikon D5100 two weeks ago and I know what you feel. I've been reading up on so much information and it does feel like there's a lot to take in. I wish my model came with a full copy of the manual instead I have a partial copy and the full version is a PDF. Blah. Anyway....
I agree with the person who said take pictures of a beer bottle or whatever, since I've been doing more or less the same thing with random objects (wine bottles and glasses being a personal favourite as I have plenty of them...and candles!).
First I concentrated on aperture, then I concentrated on shutter speed and so on and so on and in Lightroom I compared the pictures and I've been taking notes of what I found. What differences did you notice from f3.5 all the way to f22? what happens if you shoot at 100 iso one minute and 6400 iso (just to make a point) and try and determine when you would use one or the other. Then get outside and practice until you start to get it. Review your photos, select your favorites post them up here and ask for critique!
Read the manual in conjunction with practicing.

Read. Practice. Review. Feedback. And repeat.
Practice. Practice. Practice! It's the only thing that's helping me.
Also, I would shoot one picture in auto, review the information, turn to manual and use the same settings, then I was gradually change the settings until I create something I like.
Good luck and congrats on your new camera!