blu ray connection

Hi! I acquired myself an old receiver a Denon AVR 1905 but since everything now requires HDMi connection .I'm not quite sure on how to link all these 4 devices to the non HDMi receiver & therefore I need help. Ultimately my main goal is to get surround sound from any audio signal source that...

I have a cable box and an old hdtv that are connected with an rga cable since tv doesn't have a hdmi port. I'm trying to connect my blu ray player with a hdmi converter cable to my TV but can't get the movie to show, what am i doing wrong?