Can you set up icloud without using iPad?

Short answer: Yes, if you're very tech savvy.

Long answer:

If you've jailbroken your iPad, and it's online, you could probably ssh into your ipad and install iCloud from command line. You have to know a few things: Your package manager (to find and install your app from the Apple repositories) and your ssh login. You gotta look up the device on your router, forward port 22, then find your ip address given by your ISP, then use that ip to type in the following command (to a unix terminal, maybe sh or bash): ssh root@(type your ip address here). It'll ask for a password: Chances are you haven't changed it, so type 'alpine'. Use the command line prompt to type in the command to summon your package manager. From that point, type in any options and 'icloud'. If you don't know, try to find something that'll install preinstalled packages, then try scp-ing your package into the ipad, then having something install it, something like cydia. At that point, you should have installed your package, and you're good to go.