I'm 24y old never did shit before, I'm tired of being a weakling and want to gain strength and muscles but I'm not sure if I should lose fat first or focus on gaining strength first. I'm 184x73kg with I think 18%-20% body fat and almost no muscles I only have good biceps and legs thanks to genetic

Pics of me http://imgur.com/a/oQITE

What should I do first? Eat more (I did some study, I should eat 3000 calories to gain muscles) and zero cardio or eat less(1800 calories) and focus on cardio?