The first thing is to realize what the relationship was to you. Its hard to move on because she was your first. And if its someone you truly loved it will be hard to move on regardless. But in this case... take the relationship for what it is... and experience. In this case, realize that while its ending in the sense of a "serious relationship," this is good experience for your next one. Learn why she broke up with you, and how your next relationship can be better and build off of this. Also, be happy she broke up with you, because you don't want to be with someone who doesn't truly love you with everything they have. Would you really wanna be temporarily happy... just to find out they're miserable after a while of being with you? She's saving you more heartache now than later. Furthermore, because of this, you'll be able to appreciate the next girl whom you fall in love with much more.
Next, just realize it will take time. Its not something that happens over night, so even if you don't feel like progress is being made, just take it easy, and be patient.
The final part is the hard part. She wants to be friends... so that's your call. I don't know why? I suppose you guys broke up on good terms? Or is she just being nice about the break up but doesn't really have intentions of being friends? Either way... limit contact with her. The more you're with her, the harder it may be to get over her... simply because you'll read everything you do together as "is there still hope for us?" or "is she not over me yet?" Learn to say "no" sometimes when asked to hangout or something. Don't let her use you because you feel bad and will do anything to get her back. That kind of manipulation tears people apart with no positive results. Don't do things trying to get her back, just be friends. Don't try to hold her hands or even hug her. If you want to move on, then you have to take initiative to do what it takes. If she initiates the hug, then assume its a "friendly good bye hug" or what not, but it should never be more than that (i.e. hand holding or a kiss).
So in essence, time, understanding of the situation, and responsibility to respect your current friendship with her as "just friends." Good luck, hope all goes well.