PC Build - Help - Begginer

[Computech]

Hello! I have a friend is a dj and he want new pc and i want your help please!

I have a computer case(Case Midi Xman Gamer Black-Silver) and want to build a computer to process sounds. I need a help if you can how to build my PC

Thank you very much!!!

 

[Computech]

Τhe amount available is 1000 euros, I would be grateful if you tell me your opinion thanks

 

[Computech]

someone who can help me in the motherboard to put it?