Three times a week is pretty good. You also don't need to destroy yourself every time you go to the gym. 30-45 minute a session is enough.
There are plenty of good starting programs. Google "novice full body workouts" or something similar to find one that works for you. You should absolutely NOT change your workout every month.
This comes from a fad and is really only necessary for advanced lifters (people working out consistently for 5 years or more) if even then. To change the workout so your body adapts (i.e. Builds muscle and burns fat) you simply increase the weight when it starts getting easy.
You need to put on some pounds with weightlifting and eating lots of protein. Busy schedule is a common problem most of us face, try waking up little earlier and get in your morning workout. Because most likely you will be exhausted after a long day at work and school.
To build muscle mass, exercises I provided at the bottom will help you a lot! - Bench Press ( Chest) - Squat ( Full Body) - Deadlift (Full Body) - Shoulder Press (Shoulder) - Side/Front Delt Raise ( Shoulder) - Dumbell Bench Rows (Back) - Wide Grip Lat Pulldown ( Back) - Standing Barbell Curl (Bicep) -Concentration Curl ( Bicep) -Tricep Pulldown (Tricep) -One Arm Rope Pulldown (Tricep).
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