Eating a large quantity of food whilst strength training is considered bulking, now i'd say if your body fat percentage is anywhere around 16% or higher i wouldn't recommend is as that fat could be an issue when it comes to the cutting stage.
what i would recommend is eating healthy, always remember to eat all the right nutrition. now if you're planning on bulking then you need to eat a daily basis where carbs and protein is around 35% to 40% in your daily diet. doing this will gain mass but you do risk of gaining a little more fat.
When it comes to the gym focus your repetition range to around 8, if your mates are doing 15 or more then i'd say they're doing it for more endurance then size. but yes 8 to 9 is a great number for building size and strength. is you just want to increase strength then perform reps of around 4-5. now when it comes to the weight, you need a weight to lift which becomes a struggle at around last rep,
if you're going for cutting which is losing fat and getting lean then try going for HIIT training, long continuous cardiovascular activity will decrease your muscle mass for the sake of endurance.
hope i've helped
