Scolioza

First off all please excuse my english.

After 5 years of searching i finally found and buy an amiga A600. I only found the computer itself, the psu, mouse and an external floppy with db25 male cable. I only tested by plugin the monitor because i dont have the workbench disk or any games. Before register here i search the internet for solutions but i didnt find any straight answers.
You have to know that:
- i dont have 780kb floppy and i cant find a source to buy here
- i manage to to make a null modem cable i know a bit about electronics.
My problem is that i want to play games on this device and i need a way to send them from my pc to amiga. i prefer to do that with the phisical connection with the null cable. Without amiga workbench?
Thank you