Last week, I mentioned that there are a variety of operating systems available for the Raspberry Pi. One of the easiest for those just starting out is Raspbian Wheezy, which is based on Debian Linux. This process requires a computer and your microSD card, which will be the memory for your Raspberry Pi. You can access the Wheezy image on the Raspberry Pi website (https://www.raspberrypi.org/downloads). I used a microSD card with an adapter for my laptop.
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The following article provided by toptal gives you detailed instructions on how to configure the Raspberry Pi into a development server.