Hey all, long time lurker first time poster. So today before a job interview the plastic right underneath the bumper (splash guard?) caught on a parking cement block

anyway it wasn't torn off just folded back and I noticed that the screws holding it in place on the driver's side were missing. I was wondering where I could buy the screws (home depot/dealer?) and what size they were. Price would be cool too :] oh and tools I might need as well
I hope this isnt too much to ask, I am a girl and my dad decided auto work wasn't important for me and I'm at college at the moment

Thanks for any help!