Help me pick what I need, Plzzzzzz

I have an older 35 inch tv. It has a S video connection.

Just bought a Denon 3805

Crappy DVD player,

Dish Box

Question, what cables do I need to get to hook this all up, Im very beginer.

Do I run all the video cables through the Denon 3805? That seems weird.

Please tell me what cable goes from where to where, aslo the best place to buy cables

Thank You all for your help. I hope to learn a lot here.