A lot! The Internet is defining a whole new culture and you have an opportunity to be part of it, but more than that, you have the opportunity to shape it, to add or detract from it. The most wonderful thing about this is you will do it all from your personal computer. Shaping cyberspace belongs to those with access to the tools. So, get access and learn the tools. It's easy to learn the Internet. How? Ask a lot of questions and push a lot of buttons. 

Here is what you can do once you are connected to the Internet:

As an Internet user, you can send and receive messages from anyone else on the Internet. However, mail does not mean simply personal messages. Anything that can be stored in text file can be mailed: computer (source) programs, announcements, electronic magazines and so on. The Internet mail system is the backbone (and original motivation) for the network itself.

This service is also known as Telnet, which allows users to establish a terminal session with a remote computer.  For example, you can Telnet to connect to a host on the other side of the world. Once the connection is made, you can log in to that computer in regular manner. (Of course, you will need a valid user account and password) Telnet also allows two programs to work cooperatively by exchanging data over the Internet. You could even Telnet to check your e-mails and play MUD games.

Usenet - the name is a contraction of "User's Network" - is one of the main reason people use the Internet. Usenet itself is not an actual network. It is a system of discussion groups in which individual articles are distributed throughout the world. Usenet has literally thousands of discussion groups, so there is definitely something for everyone. At each Internet site, the system administrator decides whether or not to carry the Usenet discussion group. Thus, Usenet is not available everywhere.

FTP - "Files Transfer Protocol" allows user to transfer files from one computer to another. Most of the time, user will use the FTP to copy a file from a remote host computer to the user's computer. This process is called 'downloading'. However, user could also transfer files from the user's computer to the remote host. This is called 'uploading'. 

Anonymous FTP is one of the most important Internet services. Virtually, every possible type of data is stored somewhere, on some computer and it is all available to the user for free. As a full-fledged Internet user, you will come to depend heavily on Anonymous FTP.

There are thousands of Anonymous FTP servers around the world offering a vast numbers of files. The role of the Archie servers is to make the whole system manageable by helping you find what you need. 

Suppose you want a particular file, for instance, a program you have heard about. You can use an Archie server to tell you what Anonymous FTP sites stores that file. Once you know the names of the sites, it is a simple matter to use FTP and download the file. The world of Anonymous FTP is enormous, worldwide library that is constantly changing and growing, you can think of the Archie servers as the catalog. Indeed, without the Archie servers, most of the Anonymous FTP resource would be unreachable.  
(Server: a computer that all the Internet connection goes through)

The Talk facility establishes a connection between your computer and someone else's. You can the use this connection to type messages back and forth (until you get bored) 
The great thing about the Internet Talk facility is that it makes it possible to hold a conversation with someone no matter how far away they are. This also means that no more expensive IDD calls for you to contact your love ones while you are away from your country or region. The other person sees what you type as you type it, and you can both type at the same time without your messages getting mixed up.

Internet Relay Chat or commonly known as IRC is like a Talk facility for more than one person at the same time (a group of users). IRC is used heavily and offers a lot more than simple conversation. You can take part in public conversation with large number of people. These conversations are loosely organized around various topics or ideas. It is much like a telephone conference call.

Gophers provide a series of menus from which you can access virtually any type of textual information, including that provided by other Internet resources. There are many Gopher systems around the Internet, each one administrated locally. Each Gopher contains whatever information the local Gopher people have decided to share. 
Before Gopher, you needed to know the exact address of the site you wanted to connect to - the whole, long, tedious address. Once you got to the site (usually via a Telnet session), you'd be faced with a request for a login and password. If you were missing those, you are out of luck. Furthermore, once you got into the site, there were seldom any directions. 
Gopher changed all of that. It gives you menu system to navigate your ways around, no more passwords and long address.