Partial management

Hello everyone (:

now it is time..! the head revision is about to happen and I wanted to ask how and where and what parts I need! dH whether I get the original at Audi or better where else and what I need exactly?

is made:

Renew valve shaft seals,
clean, polish and grind the valves fresh,
all seals on the heads and crankshafts in the front and Simmering from the oil pump drive come in again,
also timing belts, pulleys, tensioning rollers, tension absorbers, thermostats,
new spark plugs and an oil service!

Thank you very much!