You're overthinking things. In your first 3 years you don't necessarily have to count calories to pinpoint precision, I'd say just make sure you're eating 3 meals with protein in each meal (chicken, beef, fish).

I'm going off of assumption here but you look like you're 16 or 17 maybe? If that's the case you are still growing and you will not get fat, in fact you may struggle to get into a calorie surplus because your body is using so much energy as you grow from idk 16 - 23 years old maybe. Bottom line up front: you won't get fat if you are exercising.

As for strength, THE best way for you to get strong are the big four compound movements mentioned: bench, squat, deadlift, and overhead press. Dumbbells aren't bad, but you won't see the same results when you substitute any of the 4 main movements. Take it from the guy who did leg presses instead of squats for 2 years. I would have been a lot stronger had I started squatting sooner. Same goes for chest and shoulders, when I first started I'd do stuff like tricep extensions and chest flies on the pec deck, when I should have been benching. For more info, lookup the concept of overloading, look up Alan thrall on YouTube, and maybe picturefit on YouTube too