On how to make lightsource thanx in advance

It really varies on your signature compo and a lot of different factors
The simplest way is to use a 100-150px softbrush (White color)
Adding a light source is usually explained within the steps of a signature tutorial. (at least the majority of them ).

the one im following is just sayin add a 'mother*****' light source lol

so do you know one?

Could you perhaps pm me the link to the tutorial?

so you dont hav eone