Honestly, where you're at, just start chewing through Human Action.
Unlike other long economic tomes (Marx's capital, Keynes's general theory) it's actually readable and easy to follow his line of arguing from one chapter to the next. Pick up Murphy's study guide and just work through one chapter a day or so. (It's like 30 chapters averaging 30 pages each, so even though the nominal length seems intimidating, each chapter presents one concept that is easily digestable in one sitting or so).
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