At this point mining isn't going to be very profitable, there's simply too many ASIC miners already being used and difficulty/income is based on total mining capacity so you'd barely be able to cover the electric costs. That being said, if it's something you want to do pick an ASIC that has a good hashrate per dollar and per watt that's already on the market--do not trust companies taking preorders, they almost never deliver as advertised. Most of them require a mothership, a Raspberry Pi is a great choice provided it's compatible with the miner since it's cheap, low power, and can be used for other nerd adventures when you get bored of BTC mining.
I did it with a Pi and a Block Erupter; BEs are cheap but outdated and there's probably more efficient options. As for the Pi rig, there's an easy way
and a badass way
depending on how much of a maker you are.