If you don't know how to do a project then break it into little pieces.
I think you just need a start.
How to get from BCD to 7-segment. This is a function you will need.
If you google search this you will get many hits like the IC 74LS49. There are many other parts that do almost the same thing. The data sheet for a 74ls49 will show how it works on the inside.
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Some ICs do different things with 10-15. Some have "blank" and some don't.
Now pick another small function and make it work. or ask more questions.