I try to do some daily bodyweight exercises in form of sit-ups & pushups and cardio in form of running or cycling.
My preferred way to exercise is to play Tennis.
I also listen to podcasts unless it's some team sport like football.
I try to not sit for prolonged times (by using a standing desk or taking breaks).
Exercise helps make better use of the foods you are eating and produces the hormones you need to think clearly.
Massive calorie surplus isn't making you put on muscle any faster and is just being turned into fat. And that makes sense. There is only so much muscle you can actually build naturally every week/month/year. Extra calories beyond what will be used for that muscle growth aren't going to increase that limit.
If you want a correlation between sitting at a desk and building strength to offset that, look at squats in all it's forms, and hamstring and quad dominant exercises. Your lower body is in much more trouble than your lower back from sitting at a computer. Hipflexer stretches with resistance bands will also do you wonders.
Exercise is good for you, and what that exercise looks like is almost completely unimportant. Do what you enjoy and can sustain. If you have ten minutes in the morning, do HIIT. If you have an hour after work and want to get out of the house, go jogging or ride a bike. Anything is better than nothing.
Cardio and body weight exercise train different qualities. Doing both would be better. I think endorphin release is higher with aerobic, same for increase in energy. Cardio is also better for anxiety. 2-3 sessions a week full body is better when starting. Bulking usually depend on your food intake. At maintenance, you wouldn't gain any weight. Fatigue from running is either because you do too much volume, or don't eat enough. You could bulk with 2-3 sessions/week, then drop to 1 session once you reach a weight/aesthetic you like. Cardio can help you lose or maintain weight, as it seems not to make you hungry.