You can create a map using any type of image creation software, like Photoshop, Illustrator, Paint, etc. You can also take pictures of where the shelf is situated in the library, or hold an art contest with your students to create distinctive markers for each shelf. You can also use text to describe the location for the visually impaired. This article from Classroom Architect might help.

Absolutely! You can have as many maps as you need to accurately show your item locations. Though you may need to get creative with your call numbers if you're running the same call-numbered materials in different locations (i.e. 100S - 300S for a storage location and 100 - 300 for shelved items).

While you can only have one Slideshow active from the primary /slideshow location, you can always show additional Slideshows by creating Explore buttons that link to a Slideshow URL.

Bulletin Boards and their bulletins are created from Tools > Bulletins in Alexandria. Select a board on the left, or go to the Actions menu to add a new one. Then click the plus icon to create a bulletin for the board you've selected. 

For the bulletin you want to display first, check Show Bulletin at the Top of the Board on the bulletin – but you can only choose one; all other bulletins are stacked according to content and bulletin size. However, Alexandria does try to keep everything in a roughly boxed-out shape to utilize the displayable area.

Bulletin content is entirely up to you. Use them to showcase things happening at your school or facility, let your patrons know about upcoming releases or seasonal items; you can even give specific individuals the ability to manage and create bulletins for specialty groups and organizations. Read about Bulletins for more ideas.