One of the first things I want to do after a new CentOS 7 install on a remote server is the creation of a new user with sudo privileges. Doing so is easy.
Create the user:
adduser [username]
Set a new password for the new user:
passwd [username]
Add the new user to the 'wheel' group. This group has sudo privileges by default on CentOS.
usermod -aG wheel [username]
Source: www.digitalocean.com/community/tutorials/how-to-create-a-sudo-user-on-centos-quickstart