Im 18 and still skinny as a toothpick!

5'5
115
18
Slim but athletic
 
I've been skinny ever since but now I need to take drastic actions. I'm in good physical condition with no medical complications, I don't smoke (well I hooka now and then) nor drink. I tried out boxing and loved the sport as I found a new addiction of pushing myself to the limit. I'm free most of the time, just graduated from highschool, a new image would help before getting back out..
 
I'm just a bit lost and would appreciate the help! 
 
My goal is to add weight/mass, which should I get? Mass Gainer, Cyto Gainer or Muscle Milk? I'm planning to get Cyto Gainer- Is it helpful? do you have a suggestion of a cheaper weight gainer? When are these best to take? before or after meals?
 
I've bought supplements before but I'm having a hard time of starting out a daily routine like for example:
 
Taking a weight gainer powder each morning, before meals- working out while taking an amino acid juice + whey after work outs- along with misc. protein bars, good diet and sleeping early?
-Take CytoGainer with light meal in the morning
-Early stretches or jogging (I'm on a height plan, still researching about HGH; I know they're bad and too early for me to take)
 
Having stretch regimens each week and then working out on mass/bulk twice a week? swimming or stamina building twice a week? I like to bike up the hill too..
 
I want to add muscle mass but with some fat or mass in general, do I need fat first in order to build up muscles? what can taking whey + cyto regime do?
 
Anyway I'm confused... How should I start with the proper supplements I could get, I'm on a tight budget but I have been running ever since.. 
  
 

eat peanut butter sandwiches before bed with milk

Go to the gym and build some muscle mass.

Get the Best Obliques

All the info you have posted is about the supps you take.

post more diet info!