wow, tis been a while since seeing you about here, hope your doing well =)
Anyway, while you can use WHDLoad on a basic A1200, you will struggle to access games and even a list of games due to only having 2MB of chip RAM.
For instance, if you had a full install of WHDLoad games from KillerGorilla's WHDLoad Pack's then if you wanted to load a game begining with S (lets say SuperCars 2) - you would have to navigate to the S directory and then wait for all the icons to load before you can choose which game...
once it had done this you would have less that 1.3MB of RAM left - which is not enough to load the game via WHDLoad.
if you tried to load a current listing program instead - it would use too much ram again - what AGLaunch does is provide a low-memory useage game listing for WHDLoad packs that are categorized the same as ClassicWorkbench.
you can download AGLaunch 0.7c here
it has install instructions on how to use and set it up.
Should you be using Classic Workbench then this is a drop in update - again with update entries and scripts - the install.doc explains all =)