Good luck Raffy. Sounds like your about to become very proactive.

About 6 years ago now I was like you sans any babies yet and decided enough was enough with my weight. I decided to start the second I thought about it, but decided to do it slowly and make it a lifestlye change not a diet and it worked. I lost 20kgs and even after 2 kids, I have maitianed my lifestyle.
My tip would be before you go shopping make sure you eat. When you go shopping on an empty stomach your more likely going to buy much more stuff you don't want.