Reply to Audio Interface Question

I'm currently in the process of picking out monitors and decided on the KRK rokit 5's. As it is my first pair of actual studio monitors, I have a few questions regarding the best way to hook this up for actual production use. From what I've read I'll need an audio interface, but I'm not sure what I'm actually looking for when picking one out.

I'm not looking for a top end interface, just something of decent quality to get the job done. Anyone willing to shed some light and help me out? The articles I've read haven't given me much of a definitive answer, so any help would be appreciated.