Download myfitnesspal on your phone to track your calories and macros. Find out what your maintenance caloric intake is using a calculator like this:
http://www.physiquefx.com/bmr-calculators/
1 pound = 3500 calories so if you want to lose a pound a week eat at a 500 calorie deficit. You can lose weight without tracking everything you eat but numbers are comforting. You'll know exactly what's going on. You can eyeball stuff but it's easy to cheat that way so get some measuring cups and a food scale if you really want accuracy.
Other than that, drink water. Cut out Gatorade, energy drinks, all that shit. Those calories add up like crazy. Don't forget to track sauce either. Or just put mustard on everything. There's no calories in that, just a bunch of sodium.
You can lose weight through diet alone but exercise will definitely help out.