help me build my first pc

I know it's not the best time to build a pc however I have been using my pc for 8 years and it's coming to an end. my budget is currently 1000€ but I am open to get upto 1500€, I only play league of legends. I have a 24 inch 240hz 1080p monitor. Id like to know the minimal budget I wanna achieve a 240fps stable specially during teamfights, thanks