Mk5 golf no sound has power

[Pablo9]

I just bought car it been lying for couple of months so battery was dead new battery in car my problem is my radio has power but no sound checked fuse took it out checked wires still nothing if I press cd button am hearing a beep noise from speakers I have checked car to find amp that ppl are saying could be problem I can’t find a amp this is driving me crazy having no radio I also bought a Bluetooth that plugs into lighter n seemingly calls come fro speakers nothing either surly someone will know on here lol thanks for any 1 commenting aswell