Copy Range from Sheet2 to Sheet1 through VBA

Hi everyone

I am sure it's really simple, but even through Google I did not manage to come across a helpful Code for the life of me

What I basicly need is that Excel copies the Range B:I from Sheet2 to Sheet1 whenever data is entered in Sheet2.

Note that Sheet1 will be hidden for the user.

At the same time the value for A:A in sheet1 should be filled in by looking up the value of A:A in Sheet2 and replace it with the value defined in Sheet3
(allthough once I know how to get the first part this will be easy)


Edit: I should note, that if a user changes the value of any cell, the value in Sheet1 should change as well

Anyone who could help?

Thanks
FD