I've had my D3000 for a couple weeks now and I'm starting to feel overwhelmed. I bought some books on how to operate the camera and all of that, like you all suggested. I now have an okay understanding of aperture, shutter speed and ISO. I get how they work...it still takes me a few shots and a few minutes to figure out what settings I should be using a and tweak them. But the more I read the forum (the beginner forum!), the more discouraged I get. I keep reading of metering, different filters, white balance and all of that stuff...the books I read must have been VERY beginner books, because they don't really go over that. I guess what I'm asking is this...when did it start getting easier?? Was there a time that the huge amounts of information being thrown your way finally clicked and you got it?? I sure hope so, because I'd really like to get the hang of this...
Photography is one of those areas where you have to go at it one step at a time. You seem to be getting a reasonable grasp of the basics for someone just starting out. Try and stick to one thing at a time. Put your camera on Auto or Program mode and concentrate on getting the focus down, then maybe move to Aperture Priority and play around with that setting for a while and when I say "play around" I mean it - experiment, maybe keep a few notes, although all the data should be in the EXIF info with the image, see what works and under what conditions. Forget about filters and some of that other stuff for a while and
concentrate on learning about your camera. If you haven't seen it, get a hold of a copy of Bryan Peterson's book "Understanding Exposure" - 3rd Edition/Revised and Updated and work through that.
Don't expect to know and understand everything all at once, because it can be overwhelming as you are finding out. You might want to think about joining a local camera club, if there is one, or finding a buddy to share this learning process with - it all helps. Remember though, you can only learn so much from books and from the web, the best teacher is experience and you only get that by going out and experimenting. I often take an afternoon and drive to a local park and walk around for an hour or two and just fire away at things that look interesting - try different exposure combinations to get a feel for depth of field and shoot the same thing from different angles to get an understanding of various aspects of composition. The nice thing about digital is that if it doesn't work or give you the result you expected, then you can always delete it - one suggestion on that though - don't delete anything in the camera - wait until you get back to your digital darkroom because things always look different on the back of the camera than they do on your monitor.
I had a look at your posted images and they don't look to bad...they are quite sharp and the colours are good with one exception (at least on my calibrated monitor)...the skin tones of the people look a little on the pink or red side (sun burn?

) and the colours look a little saturated - if you are not using a calibrated monitor, then you may want to research that on the web...again, take it easy on the details at first, as some of the websites on monitor calibration can get very techie and there is more than one way to accomplish this...any questions, post back here and I am sure you will get some answers.
Last, but not least, don't let the volume of data, information and techniques overwhelm you, because it will if you let it. Just keep working away at it...:thumbup:
Cheers,
WesternGuy