How can i gain weight in muscle?

how do i gain weight in muscle, when i have already lost at least 5 pounds in fat due to starting kickboxing over 9 months ago, i know that fat has to be lost first. i don't use the gym regularly and i don't like fish or eggs which provide protein, and don't really have a workout apart from doing dumbells,pressups and situps and obviously kickboxing sessions, however i am sure i've put on a few punds in muscle, as i can see and feel the difference. i'm 17, 5ft 6 and weight 8st and between 8 and 10 pounds, and am of slim build. i'd rather avoid expensive protein shakes, although diet reccomendations would be of use, thanks