You can create an AD user in a specific OU by using the -path parameter in New-ADuser. The following example will create a user in the students OU of the pel.com domain.
New-ADUser -Name “Karim Buzdar" -GivenName Karim -Surname Buzdar -SamAccountName kbuzdar -UserPrincipalName kbuzdar@pel.com -path "OU=students, DC=pel, DC=com 