I work out on an Elliptical for 30 minutes a day, but I tend to go off distance and try to do 8-9km (about 5 miles) in each session. I WAS doing it 6-7 days a week (with weight training on every alternate day), but have had to cut it back to 5 days a week due to university commitments.
I also walk the digs for an hour and a half on a Tuesay, Thursday, Saturday and Sunday (they go to a creche for the other days).
At first, it was a conscious effort to do it, but now it's becoming as routine as brushing my teeth. I actually look forward to working out (at around 10am, because my eating habits dictate that I eat every 3 hours and I can't exercise properly before breakfast, so I have to let it digest) and feel...not guilty, but weird if I miss a session.
They say it takes 21 days to make a habit, so why not try to do a little every day for 3 weeks (even if it's only for 10 minutes) and cut back once it sticks? Once it's ingrained in your routine, you won't need to find motivation, you'll just have it!
Good luck, OP. It's great that you've decided to take the first step to a healthier you! I would advise finding an exercise you enjoy so you don't look at it as a "workout", but as fun, just like gaming. Maybe try a sport like squash or something? Once I get a bit fitter, I'm going to take up running (properly, like outside and stuff) and a sport, maybe kick boxing or squash or something, depends if I fancy giving it a try or not. And it's ALWAYS better/more fun with an exercise partner.