Hi, I have never had professional advice on developing an ideal workout routine, so I figured here would be a good place to start! I am a naturally skinny dude, so building mass is my main goal. I am currently 18 yrs old, 5'10", ~150 lbs. My self-devised workout basically consists of alternating days of 1. chest/shoulders/tris/traps and 2. abs/biceps/back. Now, after browsing some threads on this site, I have realized that I need to make a lot of changes to maximize my results, but I just don't know where to start! Any opinions would be greatly appreciated.