Change the AppleID in Settings → iTunes and App Store
Trillium Number issue
After the iPad has restarted, it will ask you for a 'Trillium Number'. Enter your TDSB employee number and password.
Turn off iCloud
When the setup is complete, go into Settings, tap in the username at the top left, then scroll down to the bottom of the panel on the right and 'Sign Out'.
go into Settings, tap in the username at the top left, then scroll down to the bottom of the panel on the right and 'Sign Out'.
If you're not overly worried and just want to try to prevent your students from hitting links that take them to adult material, or there are only a few sites you want to make sure they never land on, you can use the automatic settings and the blacklist feature.
Repeat this process for each site you'd like to block access to. Keep in mind that if certain websites have mobile sites, you may need to block them separately. For instance, to block YouTube completely, you would need to block www.youtube.com, m.youtube.com.
If you find a site not blocking after you included it in your restricted websites list, visit that site and look in the Address Bar of Safari to make sure you're blocking the correct URL. Copy it if you need to and paste it into restrictions.
For very young children, or if you simply want to make sure nothing is accessible except what you specifically allow, you can disable everything and then only turn back on the sites you consider absolutely permissible.
As with the blacklist, you might need to add variations, such as mobile versions, if a site has mobile-specific URLs.