If i restore my iPhone will it erase everything?

Will it delete everything or if not how do i back it up so i can save things?

Sync everything on iTunes then restore it

Yep it will.

It will delete everything- however, if you sync your iPhone to your computer first, and then restore it, it'll be all backed up on the computer. From there, you can put the stuff back on your iPhone if you wish.

Make sure you sychronize everything you have with itunes first that way after you restore oit and it erases everything you can put everything back.