I want to do a double punch (left and right)how would I approach this>?

Well, extend/contract pecs, rotate the chest accordingly, then reverse, while moving other joints to add power/aim..

If you want to punch left and then right start with a left turned chest and extended left pec. For the first punch change to a right turned chest, contract left pec, extend left hip and contract right hip. For the second punch contract your left elbow and extend the left pec to prevent uke from flying too far away. Change to a left turning chest and contract the right pec, contract your left hip and extend your right hip.

Legs are quite important when it comes to punching. Of course you need some fine adjustments to not fly away etc.

It didnt work This is to magix

Consecutive hits aren't easy since you tend to fly away pretty easily.
Made a replay to show you the general idea.

http://www.box.net/shared/maqs489tej

It's a bit tricky to not push too much or too less.

That didn't work or i didnt do it right (i didnt do it right) I don't really understand.I might understand if you put in this form

Extend L.pec
space
blahhhh

I'm not giving you a frame by frame thing. I just want to tell you the general idea of what has to be done. The rest is up to you. Try some stuff and you will figure it out by time.

but whenever i do your advice my guy misses and kicks the guy

Well you need some tweaking to get it right but those are the most important joints for a double punch.
Consecutive hits are rather hard, you can't expect to master them in no time.
You might want to try to make a nice single punch and then focus on adding another one to it.

I can do a regular punch i just cant add on to it