newly engaged

hello all, I got engaged last night..yeaaaaa....I don't want to only have a few dresses to chose from because I'm 50lbs over weight.....Time to get this show on the road.....I need a little help getting started.,.what smart food choices to make etc. I work 12 hr days 6 days a week so exercise right now is tricky. I bring all 3 meals to work..so...any suggestons would be great!!. I'm doing 1300 caloreis a day