Which contacts will remain?

By performing this action, will my phone contacts be replaced with my google contacts? I have the more complete list of contacts on my phone and want to sync google contacts to pick up my phone contacts. After I have completed the sync, I would like to edit my contact list through google and have it automatically sync back up with my phone (any changes I make on google I want to be replicated on my phone and vice versa).

How can I take all the contacts I have from both, sort them into an excel sheet, and then upload them back to my phone and google both?