My man. A few things I have noted after reading your posts. Based on your question, the answers you received are correct. You have not given any information which could lead to an informed answer. Weight? Height? Body Fat %? Age? Experience Lifting? These are basic bits of info required to give a decent answer. If you expect anyone to take their time, please give more info moving forward. Many great and experienced people here.
You should pay the closest attention before you consider any 'supplements', you need to do the following.
1. Nail your Macros and Diet by investing in researching how to gain without getting fat. Protein; Fats; and Carbs and what percentage of each is going to yield you the best results. This is partly based on your current body composition of which you have not expressed. I'm assuming your an ectomorph. You need to understand food and how important some supportive might lend themselves to key aspects of each day. Figure out your maintenance and slowly increase calories reaching about 500 surplus over time. 500 calories surplus per day, gives you 3500 more calories in a week.
Now calories is a unit of energy, but let's not get into that, and we won't discuss how burning 7,000 calories is needed to lose a pound, but if you were to realistically increase your caloric intake in the proper ratios, you could gain 'weight'. I'd rather gain muscle over time.
Calorie King Calculator (Lose; Maintain; Gain)
2. A decent routine in the gym.
3. Dedication to #1 and #2 with at least 6 months under your belt.
Straight talking, I don't think you have any of these in order.
Remember Resting is just as important leading to Recovery and Growth.
If you could provide some more information, you will receive better answers. Just like any plan that takes you towards a goal, it has to be achievable, and the quality put in, is what you will get out. So far, you need to put some more in.