To use tabs, you want to use the "tabbing" environment. (This is all described on page 62 of the latex book). It's probably easiest to explain this by example:
This would produce:
Tab stops are set with the \= command, and \> moves to the next tab stop.
Lines are separted by the \ \ command.
Here are some of the other commands that are available in this environment:
For a full description of all the commands available in this environment, see Section C.9.1 of the LaTeX manual.