I just recently took out my first sum of Steem Dollars to try out this process as well. This guide was quite helpful - https://steemit.com/steem/@mctiller/step-by-step-guide-sending-steem-dollars-to-bitcoin-to-ususd-via-blocktrades-and-coinbase
...thought I'm not sure Blocktrades is the best rate for exchange at the moment. Nevertheless, a good step is to sign up for a Bitcoin wallet at the moment, I use Coinbase which also allows me to track prices and use a debit card that I'll be receiving soon.
Hope this helps!
Great, that thread looks like what I was looking for...thanks a stack @hansikhouse