All these games require ISOS except PS1.  The way i heard you get an ISO is by linking you system with your PC and using a online game and a ISO ripper to trick the system to downloading the game to you computer.  There is no purpose in this because emulation has barely begun on these systems.  The few games that are emulated ned extremely fast computers to run them.  So don't even bother.

 

For PS1 the emulation is a bit better.  You can put a game in you CD drive and let the computer read it directly.  The only problem is a small amount of games are emulated. Chances are you won't be able to play most of the games.  As for emulators, you need a good emulator, all the plugins, and an extra file.  In the readme's it should tell you the name of the file you need to download.  I'll upload them later bu for now you can do a google search to get them.