Your best bet will be to use PSX. Its easy straightforward and doesn't need any plugins configured.
This sites AUP prohibits the requesting or sharing of information relating to acquisition of game roms or romsites so you will have to play with Google until you find what you need.
You will need a bios file the most common one being schp1001.bin (google it). Once you have found or ripped some PS1 ISO's (roms), and downloaded the Bios and PSX do the following.
Open the PSX folder and put the bios file into the folder marked bios.
Put your ISO's into the folder marked cdimages.
Double click the PSX.exe and the emulator will start.
Select 'file' from the toolbar at the top and select insert cd image. Browse to the location of you ISO's and double click the one you want to load.


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