Hello 
I recently bought from ebay an amiga 500 and i am pretty much excited!! I never owned this amiga model and i can say that is a real beauty 
To my questions...
I want to use workbench 1.3.2 as operating system.
1.) How i can possible do this? I mean i want the operating system running from HDD not floppy.
2.) Do i need an accelerator board with scsi controller and HDD. Is there an alternative way to have HDD to an amiga 500?
3.) Do i have to buy newer version of kickstart roms?
4.) Is it possible to use whdload to this machine?
Any other ideas are welcome of course 
Thank you.
A 500 usually comes with 1.3 ROMs. If it has 1.2, you'll probably want to track down newer ROM's but those are common enough.
For the hard drive you need some sort of expansion to facilitate it.