You would have to Google, and start following up on various references. You'll have to read a lot of technical specifications, and just keep reading and reading. ISO is a filesystem. You have to go to an even more basic level, and understand what a CD is, on the technical level. You aren't just reading from an arbitrary filesystem, but you're emulating a CD drive.
Are you seriously asking me for details? I can help clear up confusing points, but you're asking me to do your research for you, and that's rude.
Of course .. I am not asking you to do my research... I was just wondering if you have done this before... and that is how you knew what to do. I am really trying to follow step process.
Everything in dev to some extent has a step by step process.
1. I need to dev a device driver
2. I need to understand how to emulate iso9660 and other file system formats.
3. Need the appropriate libraries.
4. Need the compiler info.
5. Etc..
Like for example I just found out that in order to dev this project... i am not writing a Kernel-mode driver but a user mode driver, because the driver is going to emulate the file system.
My main point is the best sources are those who have done it and would like to share with others the path to enlightenment. So that I don't do down a wrong path. I do much of the research and dev. but much of this has been done by others ... and I would like to see what they had to know and how they found their info... so my work load is less...
Sorry for any confusion... ;)
Cheers