You can only directly enter the page number to jump to when using Pages '09 v4.3. No release of Pages v5 supports this feature.
Autosave is enabled after the first document save. Subsequent edits in the same document are autosaved. Autosave updates a document about every 15 seconds on the boot drive, and depending on network conditions, longer for iCloud documents. Any new Pages document that is not initially saved, will lose all content on quitting Pages.
The revert to previous document is a manual process located on the Pages File menu : Revert To : Browse All Versions… and uses an interface similar to Time Machine to browse and restore previous document versions. You can also select the document icon, and press the Space bar to invoke Quick Look while in this browsing window. Trust me when I say there is not one line of AppleWorks in Pages v5.
I always encourage people to immediately save their new, empty Pages document with an intelligible name other than Untitled.pages. This triggers autosave, and now ANY added content will not be lost.
-- Optional --
If you Mac is pre-2011, you can have Snow Leopard 10.6.8 on a separate drive partition, and AppleWorks 6.2.9 installed there. Dual-boot arrangement. If you have a newer Mac with 8GB (ideally 16 GB) of memory, then you can install the purchased ($20) Snow Leopard Server DVD from the Apple Online store (phone in order), and then install that version of OS into VirtualBox, Parallels' Desktop, or VMware Virtual Machines. Once AppleWorks v6.2.9 is installed into the Snow Leopard Virtual Machine guest, you can access AppleWorks in the Virtual Machine either in windowed or full-screen mode while concurrently running your El Capitan. Implementation would be dependent on your computer skills.