Though not required for your book project, Indesign is a good way to create PDF pages for print. Follow these steps to create an Indesign document, create doc bleed settings, place your images, and output for print:
1. Prepare your images. Save indiviual Photoshop PDFs of your print pages from photoshop with easy to read names like "book_haltone.pdf" etc. I would recommend changing your canvas size on the images with bleed so you can get that bleed later (for example change canvas size to 8 x 7.5 so you have an extra .5 in around the edge, make sure your background is also filling this new canvas size for these images that include bleed)
2. Create a new Indesign Doc: Open Indesign CS5, go to Create New > Document in the open page or go to File > New > Document.
3. In this window set these: Set the number of Pages to 20, Width 7.5 and Height 7, uncheck "Facing Pages". Click "OK"
4. Set Document Bleed: Go to File > Document Settup > Enter .5 in the top Bleed field and press the tab key or hit enter (it will set all sides to bleed if you set just one side because they are all locked together for uniform bleed). Click "OK"
5. Place your Images: Got to File > Place. Find on of your book pdfs you saved from photoshop and select it. Click once on the page you want to place it on in Indesign. Now move it into place.
6. Scale your placed image if necessary (if you made your bleed images with bigger canvas sizes this won't be necessary: Hold down the Shift and Command keys while scaling using the tranform box around your image. This is the way that Indesign scales proportionally. If you don't hold both keys while dragging, your image will not scale. Don't scale so far your image is cut off by the page size. (though not perfect this is a way for you to get some bleed for this assignment)
7. Create PDF of your print pages: File > Adobe PDF Presets > "[High Quality Print]". Name and pick location.
8. Set Marks and Bleed in this PDF! : In the Export Adobe PDF window that comes up, click on the "Marks and Bleed" Section on the left side below "General". Check "Crop Marks" and "Use Document Bleed Settings"
Now you have a PDF with crop marks and bleed, ready to print!