Hi I'm an 18 year old 5'9", 125 pound rail of a guy just sort of starting to try to build up some body mass. I am most concerned about my upper body muscles, as I have played soccer all my life and already have decent legs haha. I recently got a set of dumbbells and have been doing some basic exercises with them such as chest presses, bicep curls, shoulder presses, and shrugs. I've been doing these exercises almost daily along with the standard push ups and sit ups. Im not really looking to get a gym membership since I am currently in college and low on cash and time. I was just wondering if anyone had some tips for me as to how often I should do my "routine" and if anyone could reccommend some other exercises that would be beneficial to add some upper body mass/strength. Thanks in advance!