Matlab graph display help

Hello to everyone here,
I'm completely new to matlab, and have recently been given
a project to display a graph in real time. However for nwo;
i'm already having problems displaying in static form.

my first problem is that i have a .dat file which has 4
lines of header,ive tried using the import wizard but i've
had no luck to load the file. I basically need it to omit
the four lines and store the info somewhere where i can
alter the data, and then use it to produce a graph.

the data is in the following form:
2006/12/01 13:33:00 1 2.5 48
2006/12/01 13:34:00 2 2.5 49

I need to plot time vs. the third & fourth column.
I will at some point need apply formulae to the third
column,but for now i would just like to see it dipslaying a
graph. The problem i'm having is with the time & date
stamp.how do i get it do display the time & date stamp
along the x-axis, and in the right way (01/12/2006
13:34:00)?

if anyone could help me with it would be great, i've looked
at the help files, and it has some useful information, but
i get stuck knowing what commands to use and how to apply
it.

Thanks To ALL!!