How To Build Muscle for a Beginner

I'm a 20 year old male and I'll be turning 21 in a few months. I'm about 5'11 tall and 170 Lbs and I want to start building muscle again. When I was in high school I started working out and lifting weight when I was a freshman, and stopped in the middle of my sophomore year. when I quit lifting I had a little bit of muscle but not too much, like it wasn't showing unless I flex. I stopped because I didn't have time anymore. School, work and things like that. Now I want to start going to the gym again but I don't know where to start. For example, what workout machines should I use and how many sets and reps and for how long and how many times a week. I'm also a picky eater so I don't eat most foods. I do eat tuna, turkey, chicken eggs, meat etc.. but not fish. I also eat fruits and vegetables but I don't like that many vegetables I'm picky on which ones I eat. I don't want to get very big (muscle wise). I just want to get lean like I want the muscles to show and lose the rest of my stubborn belly fat. I'm not fat or skinny, I'm in between. Right now I only want to focus on my upper body. Once I start to see results I will start working on my legs as well

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