1.useradd {NAME}
2.passwd {NAME}
3.chage -d 0 {NAME}  : To force user to change password when first login
4.create user home directory and chown to the user permission.
EX: mkdir /home/{NAME}
chown {NAME}.{NAME} /home/{NAME}

How to List & Add user from a particular group in linux
List
$ grep ^{GROUPNAME} /etc/group

Add User into Group
adduser {USERNAME} {GROUPNAME}