Here's how I want you to stroke using only your first finger and your thumb wrapped around your cock:
* Start at the tip and push your fingers just over the head
* Stroke back up over the head up to the top
* Now stroke all the way down to the base of your cock
* Slide your fingers back up to the top over your head
So, it's basically an alternating pattern of short, long, short, long, etc...
Let's start off with a firm grip (only using first finger and thumb) at a medium pace...how does that feel?