Want to train

I never trained before and want to start going to the gym to get hench.
 
A little background first, I have lost quite a lot of weight a few months back and now my skin is all nasty and saggy, i want to train to fill the loose skin.
 
Should I go on a keto diet since i probs have quite a high bodyfat percentage or just the normal diet for gaining muscles (carbs)?
 
I am 5" 9, 16~ stones and Asian.
 
Pic below (beware, its pretty nasty.)
 

 
p.s. im an ex smoker too, i kicked my 8 year 20 a day habbit back in june.
 
Comments and suggestions are very welcomed, thanks.

Hi and welcome
You should eat a normal carb-included diet, but not to put on fat, just to gain muscle.  Well done on the weight loss though.  You may have to get the skin around the mid-section surgically removed
Have a read of our articles here: http://articles.muscletal...uilding-beginners.aspx

Welcome.