New here and have lots of ? Please help me!

[GillianFan]

Hi! I'm new I just got a Blu-ray Disc Player with 1080p Output, My HD tv is a westing house LTV-19w6 I want to say around 2 years old? I have a hd cable box. Now to have my dvd player hooked up I have a module box with yellow white and red wires. Today I went to Radio shack to get HDMI video to make the standard dvd's better quality I brought my manual with me and my tv does not have the port. So I got a monster flat screen cable with the wired red green blue 3 of them go in the back on the tv, and the other 3 in the back of the blu-ray player. Now the guy said it would up my standard dvd's 3 times but I see no difference. In some scenes I see grain and lines. Also he said the blu-ray quality would be 3 times better! I rented a blu-ray dvd the quality is really nice like watching a HD movie. But the sound not so great the sound on my tv was never great. Do I need speakers? Or should the blu-ray still have great sound? I did also notice grain in some scenes while playing the DVD although it's a rented dvd could that be it?

I basically would like to know If I have to have a brand new tv to get the full blu-ray quality? At blockbuster they had a tv with amazing quality. I have to say mine is not the same!