I am also the same.  Although I don't work outside of my home, by the end of the day I am so wiped out from everything else I'm doing, I just want to lay on the couch and watch television.  Although I live in south Texas, winter is so not my time of year and keeps me indoors much of the time.  I do believe though that a simple walk around the block is a good place to start.  I also know that when I tell someone I am going for a walk or to the gym (which I haven't done in I don't know how long), I generally tend to do it since I've made the commitment.  Good luck!

I am truly a couch potato especially in the winter months. Once I come in from work, where by the way I also sit all day, I lay on the couch reading or watching television. I know I have to get up and do something. What type of exercise should I began doing being that I have never exercised?