Tweet and twitter . . .

My sister has been telling me for quite some time that I need to join the world of Twitter.  I finally capitulated today and created an account . . . 

                  @nurneysjourneys

Now I need your help!  What to do with twitter?  Suggestions on hashtags?  For someone with several graduate degrees, I am woefully inadequate when it comes to technology and social media.  Your advice would be greatly appreciated!