I am New to film Photography (ABSALUTELY LOVE IT!) And I've been reading and reading about ISO, Shutter speed (I think thats ISO?) Aperture/F-Stop and theres a third one or something UGH i can't remember...

but all 2 or three of them go hand in hand I think to take a great picture...
My pictures I've developed I think look like they don't have enough light (I used flash) I am using a Pentax sn1? (I think) and I have a Pentax flash, AND its built-in flash... I think NOW it is the F-stop... I said it to 5.6 I think... But it differs from different lighting conditions...? Can someone please explain to me in detail without pushing links to read or books to read please (Regardless HOW great this link or book is it will be useless to me, I've been ALLLLL over the internet and my university text bok and I'm still here hahaha )


BITTE UND DANKE!!!!!