New pc

Processor Intel Core i5-7500 (3,8 Ghz)
Mainboard Gigabyte GA-B250M-DS3H (mATX)
Graphics Card EVGA GeForce GTX 1070 (8GB GDDR5)
RAM 16GB Corsair Vengeance LPX DDR4 (2133 Mhz)
Harddrive (SSD) 525GB Crucial MX300
Power Supply 500W Corsair CX Series (80+ Bronze)
Case Corsair Carbide Series 100R

have a look at this site https://uk.pcpartpicker.com/ and play with your suitable options.

Need a new PC i have a budget of around 800 dollars and i want to get some good parts so my computer can run well

You can buy MSI. MSI is perfect for games you dont need build new computer.

I built mine earlier this year for less than $800 and it runs like a charm. I used a site called pcpartpicker to help make sure things would fit and get the best deals. Most of my stuff was bought off NewEgg. My case was like $30 I think and it came with pre installed fans (3) which is very helpful imo.