When observing planets, wait for them to get pretty high. The lower they are, the more blury the image will be.
When it comes to eyepieces, I'd recommend getting far more comfortable with the ones you have before buying more. A couple of really good eyepieces is typically better than a kit of five average ones.
Barlows are good for getting more magnification on nights of great seeing but I typically use eyepieces unbarlowed. Be aware that some eyepieces barlow better than others. I'd worry about a barlow much further down the track as it's important to get a good one and good ones are expensive.
Hope this helps.
Have fun,
Doug
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