Twenty Ten is the first theme I always use when launching my WordPress website. It loads super fast, easy to navigate and always has high pageviews because it's so simple to navigate.
You can customize it to your liking, add sidebar elements and play around with the code pretty easily. I highly recommend you start with this theme so you can focus on writing good content for your readers.
You may outgrow it in the future, but for starters it is the #1 theme in my opinion.
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