Hi shanerpark.
Congrats on getting your 1GB SD card. To be able to access the card on your PC you will need an external USB card reader. You can get one from any office supply store, computer supply store, etc. They are inexpensive.
You can install programs to your SD card during the Activesync install process. When your PPC is docked and you are installing a program to the PPC it will ask you if you want to install it to the default location. Click No. It will then give you a list of areas where you can install the software. If your SD card is in the PPC then the SD Card will be one of the choices. Select SD Card and click OK. The files will install to the SD card. Depending on the software some files may still install in \Windows which is in Main Memory. Also be mindful that any software that has Today Screen plugins should be installed to main memory.