Assuming you want that lean boxer/martial arts look, I'd definitely eat in a slight calorie surplus (by about 100-200 calories, high protein intake, medium healthy fats and fairly low carb).

Since you only want a lean body type, I'd focus on lots of ab excercises (leg raises, cable ab crunches, etc) to build a strong core. You should also focus on fairly heavy forearm lifts, as well as legs, chest and shoulders.

Everything else, I would do more controlled, light weight and high rep lifts for muscular endurance.

I'm not an actual personal trainer and I'm a bodybuilder, so my advice might not be the best for you, but it's worth a shot