Well, there is no workout to just gain mass, buddy. Regardless of which training program you stick to, it all depends on the diet that you have. Ok, here's an example. If you are looking to just maintain your weight and a little muscle, you consume 1 gram of protein per pound of bodyweight that you have per day. So that means you need to consume 196 grams of protein per day divided into meals. But if you are looking to add serious damage, 2 grams per pound of bodyweight is what is needed.
You also need to watch out if what you are gaining is indeed muscle mass or fat. Now in order to do that, you must monitor what you are eating. Ok we said 196 grams of protein per day right? So that's 44 grams per meal if you eat 4x a day. Salt and fat should be kept at a minimum, and carbs should be consumed at a pace. To be honest, I don't know the computation for consuming carbs buddy. What I do is just eat carbs in the morning before workouts, and vegetables and a small amount of potatoes in the afternoon.
For your workout, you just need basic exercises to build up. No need for complex exercises yet.
Say you do chest and triceps on Monday.
Bench press 4 sets
Inclined press 4 sets
Flat Dumbell flyes 4 sets
Close-grip bench press 4 sets
Standing tricep cable pushdown 4 sets
One arm tricep extension 4 sets
That is just an example of a basic routine you can do. Complicated workouts such as dropsets,supersets,giant sets and whatnot are, in my opinion, done when you are in a plateau or need to change your routine to shock your muscles.
Did this help, dude? :)