FireFall

Hi all This is my first time here and i was wondering if someone had try and did install Catalina or Mojave on a Dell 3010 / Radeon RX 550 2GB before and can give me help or guide installing the system on that machine i didn't try to install macOS before so this 's my first attempt i searched before on guides on that specific machine but it was to little information that i got and it always so confusing so if anyone can help me i will be grateful my specs are Dell optiplex 3010 MT Dell 042p49 a00 / H61 socket mother board / A22 latest BIOS Dell U2212HM display 8G RAM 2x4 1600 mhz AMD Radeon RX 550 2GB GDDR5