Actually you can use iCloud with the Mac running OS X 10.5.8. You don't sync the documents - you upload to or download them from iCloud.
You can open a browser on your Mac - Safari is preferred - log into icloud.com, enter your username and password, click on the iWorks icon, click on the Pages section at the top - and then you can drag documents into the browser window to upload files - and you can select a file in the cloud to download to the Mac. I do this on my iMac at work running Tiger 10.4.11. It's kind of slow - and you will get a warning that you may be using a supported browser - but it works.
In any event, you can use iOS file sharing to send the Pages docs to your iPad. you have to connect to the Mac and do this via iTunes.
Just tap the arrows in the toolbar in Safari to go back and forth. You can open multiple pages using tabs. tap on the + sign to add another tab in Safari.
Sure; just use iTunes.
As to going back to previous page, just tap the left arrow, upper-left of the window in Safari, much as you would in any other browser. If you've closed the window, you can find the previous page in the History. Read the section on using Safari starting on page 40 in your user guide.