If it's been a long time since you last worked out or regularly kept fit, starting off slow is a really good idea. Throwing yourself full force into a workout routine can potentially be too much and you might find yourself too physically taxed and want to give up before you've even given it a proper chance!
Depending on your level of current activity, you might want to start off just walking for half an hour 3 times a week. After dinner is a great time to go for a walk.
If that sounds too easy, you could try going for a short jog instead. You could do a little bit of both -- alternate jogging and walking.
If you don't like cardio, you can start off with some strength training at home with push ups, sit ups, squats, lunges, etc. I suggest starting off doing something you want to do. Once that becomes a habit, then up the ante and take on something a little more challenging.