Setting Up a 14.04.4 LTS Ubuntu Server to Hack.

Greetings fellow studens of the Null byte community.

I'm still a student so still learning so excuse me if my questions seems silly or not making any sence :).

So here i go,

I've just downloaded Kali linux + a Ubuntu 14.04.4 server on the Oracle Virtualbox. And i? currencly setting up Mail servers,FTP,abache, server to later on start to hack:)

Now my question after making those functions on the server. Does this seem a good beginners project to do? :) I've just finished the Linux basic commands and the Recon how to's . so thats my skills atm.

Also would anyone mind showing my a little guide direction on starting to exploit a server on my local virtual net. I? still new so i cant script yet but i wanna become better :)

Thanks everyone for reading this.

Greetings!