Help with PS1?

Hi! I just revived my PS1 'cuz I want to play my imports and backups.. Problem is, I can't play 'em.
my PS1's an american one.

I don't have a retail/legit disc, either, just backups and imports.

Help?

PS: I can burn iso and others on a dvd-r disc if I have to. All suggestion will be noted. Thanks!