ATI/AMD Radeon HD 6470M "Seymour" on macOS Catalina - how to get it working?

I am Hackintoshing for the first time, and I'm using a very old Lenovo Ideapad U400 as a trial. So far everything worked perfectly except for two things: my internet did not work until I loaded a kext (AppleIntelE1000e.kext) for my Intel Ethernet, and I couldn't find any WiFi kexts (at least I got the Ethernet working. However, I cannot get my graphics card to work at all. I am stuck with Intel HD Graphics 3000 and it only is providing me with 800x600 resolution, which is horrible.

I can't find a way to get this working. I can't disable integrated graphics in my BIOS, I already tried that. I heard about some ways to use Clover, but I have close-to-no experience with Clover. Can someone help me get my graphics card working rather than using integrated graphics? I'm getting sick of no acceleration and barely seeing a tenth of all my windows? I'd prefer 1366x768 resolution and higher.