Needing custom firmware

Hello, I have an ender 5 and currently trying to use the zonestar ZM3E4v2 board x8 tmc2208 and 4in1out single nozzle hotend. I have the standard ender 5 LCD and need help creating firmware, ive tried to piece things together but get compile errors or just a blue display screen. Willing to pay for the fir.ware.