Hi,
I would suggest SFS and Classic Workbench, partition sizes:
SYS(DH0) = 500mb
Work(DH1) = 3gb (ish)
Games(DH2) = The rest (7-8gb)
Follow this guide for settings up SFS:
http://wiki.classicamiga.com/How_to_..._within_WinUAE
Take a look at the CWB Turtorial for adding Large Disk support:
(Patching SCSI Device)
http://classicwb.abime.net/classicweb/tutorials.htm
You can also setup DH2 as the 'Games' assign, following the tutorial and then copy the KG packs onto that partition:
http://kg.whdownload.com/kgwhd/
Classic Workbench makes life so much easier as it has everything you need to get the most out of your Amiga with the least hassle.
Which pack you choose depands on the specs of you machine, if you have only a 2mb A1200 you will need at least a Trapdoor Ram expansion to get the most out of it.
Have fun!
Steve.