Migration is a service Compiere.org offers, that will fully tackle all the related issues. U have to purchase their service at http://www.compiere.org/
I did write some guide > 1 year ago at http://compilo.sf.net/
so look into it there. But like i said elsewhere its my principle not to write anything that overlaps with what compiere sells, thus i wont assist further than that.
If there are other consultants experienced that u need, u have to make an offer for them here. So pls state the fee u alot and they shuld contact u here or privately. But they cant do much without the purchased service.
have a nice day