The good news is this is really, really easy (and in fact would
still be classified as a medium server farm).
Just install sharepoint on a new box (making sure all patch levels
are the same etc), make sure you install without installing SQL
server etc. and when you come to the step to specify Configuration
Database settings point it to the existing configuration database
instead of creating and new configuration DB. I then seem to recall
a step for configuring the components for each server and you would
just have to check the option for web and search for the new
server. Just in case you were not aware if you have 2 web servers
your indexing and job server MUST be on a separate server, which is
not the case if you have a single web server.
You will also need to make sure any web parts etc that you have
installed are installed on the new server.
sorry if this is a little sketchy, it is at least 6 months since I
last set up a server farm. I always refer to a document
entitled "Deploying medium and Large server farms" which should be
pretty easy to find on MSDN