I wouldn't advise rushing right out and replacing what you've got (unless you're very gainfully employed, and money's not a serious object.)
Instead, use what you've got until you have a little experience. You'll learn what annoys you about it, and be able to make a better informed decision when you do buy, and won't end up replacing gear 3 or 4 times. (Hi, I'm Glenn, and I'm a recovering gear addict. My sponsor, Andrew, who owns the local backpacking shop, starts grinning when I walk in. I don't think he really gets the finer points of my twelve step program...)
You don't mention a sleeping bag. This would be one thing I'd urge you to spend some money on - don't try to do this on the cheap at Dick's. There are several good threads here about sleeping bags, so do some research. If money is an issue, try the various clearance sales and outlets - see the links at the left.
Take a trip - then ask us some specific questions based on the results.
(And remember, we're not laughing at you, we're laughing with you - because we've all been there.)