user not in sudoers

[Johan Scheepers]

Good day,

Not used to ubuntu. Using Fedora, Centos, Mandriva.

Want to use and and learn ubuntu.

While waiting for ubuntu 11.04,  I installed 10.10 to get used to it.
Now this sudo term. When I use sudo for a root command it tells me I am 
not in the sudoers file.

This is annoying. How do I get myself (user) in the sudoers file.
This is at home and I am the only user.

I am used to become root when required and get out when finished. Would 
rather have the OS operating as I am used to.

Kindly some advice please.
Thanks
Johan S