RCA Victor RCA-6T71 (Where to start?"

[Coshi]

Hello everyone. I'm back after a long interlude about 4 years.
But I've got a new TV and this will be the first TV I've actually repaired that is this old, And I was wondering where to start? I've replaced the vertical output tube because it was missing and cleaned the dust out and checked for shorts but I don't know where to go from here? after starting it on the light bulb cord no shorts I plugged it into mains and god buzz and some soft audio under the HUM and a raster. So any ideas on where to start with gitting this thing ready for everyday use again?

Heres a picture of what I got so far,