That's great! He should be able to give a little advice and support on the diet front. Don't get too bogged down with macros. Balanced diet is best. Your new language is calories though.
My advice is to get a calorie app like myfitnesspal or something on your phone. You can then start logging everything that you eat. I also suggest you weigh all your food especially at the start, as guesses can be wildly out. You are only after a small calorie deficit and if you are guessing with food you could suddenly be over cals that day or multiple days and you wont lose any weight!
First step though is to figure out how many calories you need in a day. Google 'harris-benedict fomula' and punch in your numbers. This will give you a rough estimate. Start weighing weekly in the middle of the week (I say middle because most people if they deviate from a meal plan tend to do so on the weekend, and a high salt or carb meal the night before can affect scale readings the next morning!) If you haven't got a set of decent accurate scales get some. If you stand on it five times and get different readings each time choose another one. I've got a set of weight watchers scales and they are mint. On your weekly weighs you can then adjust calories depending how quick you gain or lose weight.
As for the training side of things four days is a good aim. Personally I recommend for beginners to try out stronglifts
. Not only is it effective, but it teaches you in great detail about the big lifts like squat, deadlift and bench. Don't be one of those pink dumbbell girls. They are wasting their time. You can build more muscle with these big exercises. They may be intimidating at first, but work your way up slowly, pay close attention to your form (how you do them safely) and you will not look back.
A little info overload I know but this is what I would have wanted when I started!