Hi Bugsby,
Welcome to Pages '09.
At one time we've all been new users so not to worry.
From within Pages you cannot Save, Save As, nor Export to JPG. However, here's a way around it:
1. Create your collage
2. Assuming you can see your entire page, do a Shift Commnand (the Apple Key) the number 4 key.
3. Draw a box around that collage. When you lift up your mouse button it will create a Picture One.png file on our desktop. PNG files are a standard file type such as JPG.
4. Open that Picture One.png file in Preview then File > Save As > JPG.
5. Or you could send that PNG file as is. Windows users can open PNG files.
These Discussions are enduser helping enduser, not Apple employees answering questions. Apple provides these discussion forums for endusers however, Apple neither monitors nor engages in discussions. Enduser such as yourself when they have extra time answer questions.
Again, welcome to Pages '09 Discussions, have fun here.
Cordially,
RicD