Why won't my iphone sync with iTunes?

Today I tried to sync 36 new songs onto my iphone off of my computer. In the process I accidentally deleted all of the previous 210 songs on my computer although they are still on my phone. Now my phone and computer and phone don't sync at all anymore. What's the problem? How do I fix it?

I don't know. I can't do it either. Itunes is not user friendly, well at least to me. Hrer are the instructions http://support.apple.com/.../kb/ht1296

I always plug it into my computer. Itunes doesn't list my 1,100 songs in there though. I don't know why. I think I'm missing some xml document

Every time you connect your phone with itunes on your pc is require delete all songs from your itunes library and read again songs in itunes library for your iphone to synce. Note, if your pc does not have any songs
then transfer songs to your pc. Never use iphone because it is gathering much

Make sure that your Iphone is connected to your computer. After that, go to phone's information and you will see there your music. Just drag and drop songs from PC (music) to itunes (Phone music library)

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