First, congrats on the 17 pounds! That's nothing to sneeze at!!
When I started, I just tried to consciously move more. Take those extra steps that I tended to avoid. When I started more actively exercising, it was just walking 10-15 at a time. I was fortunate enough to be able to do that.
But there are all kinds of things you could do. Get weights (or even cans to start) and do arm exercises! Leg kicks! Ab crunches!
For me, one thing that has helped is simply committing to exercise (even though I haven't ever liked it). I started off with small goals and built from there. I committed to a number of minutes/month. I sometimes have to really convince myself to exercise, and tell myself it's not about what I want at the moment, but it's something I HAVE to do. Like paying the bills...
My 5 C's of healthy living: Commitment to conscious control, with the understanding that choices have consequences