Hi Gem
Download PHD which a fantastic freeware guiding software.
http://www.stark-labs.com/phdguiding.html
This program should be able to manage your webcam, if not Brendan's advice re Orion autoguider or Qhy5 is the way to go.
There is plenty of support for this software
http://www.stark-labs.com/craig/arti...ig%20Stark.pdf
You still need to polar align your mount Gem. If your imaging telescope is rather heavy you should also consider a side saddle mount. This allows you to mount your guide scope next to the imaging scope.
http://www.bintel.com.au/Accessories...oductview.aspx
Good luck
Regards Paul.