Need help buying gaming setup

I currently have a ps4 but am tired of paying £50 for games which run at 30fps and 780p. I want to buy it gaming desktop but I don't know anything about computers. My budget is £1100 but with that I need to buy a monitor as well as the Pc and I don't trust myself to build a Pc so I would like a pretty built one. I want it to be as powerful as possible with good graphics. Please give me suggestions and preferably links thank you.

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hey did you managed to build a good gaming Desktop cause looking at your budget I am sure you could have build a good high to enthusiastic level rig