I want do display a number represented by 8-bit binary value on a 7-segment display gate. I don't know how to do this. For me, this display is toatlly useless. Do something with this.

You can do this with a binary to 7-segment decoder circuit. It's purely combinational and all gates necessary to make one already exists.

Here is one of many tutorials out there: BCD to 7-Segment Decoder