The first step should be to clean up the diet. Stop eating things that have tons of empty calories and don't add to muscle building. Ditch the chips, sodas, cookies, and ice cream. This simple step can have a big impact on fat loss.
Instead, focus on eating good things like steak, fish, poultry, eggs, milk, nuts, fruits and veggies. These types of foods have value when trying to build muscle and reduce fat. Don't worry about portions, just eat good until you are satisfied.
While you are eating good wholesome foods, start tracking the calories and macros in a daily food log. When your weight levels off, then you'll have a very good idea what your maintenance calories are. This will make further reductions more precise instead of just guesses.