How do I view what's in my icloud?

Look within the apps that you have set to On in Settings>iCloud (contacts, calendars, mail, reminders, your my photo stream album, etc). In addition to that, you may also have an iCloud backup if you are backing up to iCloud, but you can't view the backup. You can also view some of this data by going to iCloud.com from your computer browser and signing into your account.