All good advice bro's.
Go over to the diet forum and learn about what a good bulking diet is. Then plan your diet and post it up in the diet section for the bro's to see and give advice on. Break down the calories, protiens, carbs, and fats in grams for each meal.
Then do the same in the weightlifting forum. Post your whole routine so the bro's can help you with it.
Then train hard and work your diet plan for at least the next six months. I'll bet you can put on a good fifteen pounds of muscle naturally with your diet and training in check.
Then if you can't stand it anymore start your cycle. This way you'll put on 15 lbs. naturally, and another 15 lbs., from your cycle. That's a thirty pound gain over the next year instead of a 15 lbs. gain just from your cycle.
During your six months read everything you can about pct. and aquire all that you need to do it properly, so you don't loose your hard won gains.
Steriods are not a magic pill. You have to train harder and eat better then you ever have in your life for them to work properly.
Also be patient, you see these big guy's in the gym they did not get there overnight. Some of the big guy's you see have been training for 15 to 20 years to achieve the condition they are in.
Bodybuilding is a marathon, not a sprint. It takes years of proper diet and training to build and keep quality muscle.
I was thirty nine before I ever touched gear.
Best of luck and do this right and you will be rewarded, try and take short cuts and you will be disapointed.