How- Sync to a new laptop without losing iPhone music?

Hi! I went to get the new iphone today (ack; cracked screen!) and I was told I needed to 'sync' my info from my old iphone first onto my laptop. 
I am very thankful for those who take time to answer a cry for help; you will never know what it means to the other end of the computer who needs help.
So....I went home and tried; but it looks like I lose all the info on it. 
My laptop is new; I've never synced it before.   The laptop does have about 20 audio files I would like on the iphone, but right now they are in the computers 'music folder.' 
When I press sync; the bar at the bottom of the sync page is significantly smaller which leads me to believe that on my iphone the 500 songs are lost and replaced by these 20 songs. 
I'm worried that everything is going to be lost with my contacts, calendar, etc.  My iphone is the one up to date. 
Can you help?  I really am looking forward to a new iphone!  THANK YOU!!!! 
Juls

See Here  >  https://discussions.apple.com/docs/DOC-3141

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