The first thing you'll probably want to do is lose weight; just remember that weight loss doesn't automatically mean fat loss. Emphasize your protein intake instead of carbs and fat; keep up your exercise and weightlifting during your weight loss journey. This way you can ensure that you're primarily losing fat and not muscle or water.
Another helpful way to get a six pack is to avoid the other six pack (alcohol). There's a reason why it's called "beer belly" - alcohol intake usually puts weight around your midsection, so you'll want to avoid over-consumption if you want a six pack.
Also don't neglect the core workout. Even if you aren't striving for a six pack, core workouts are super important for preventing neck and back issues, as well as improving your posture.
Don't forget to get your six pack today!