First - I'm not picking on you, but it is clear from your questions that you are a bit unprepared for the level of circuit design you are attempting.
If you are doing logic circuit design with real-world parts, there are some concepts you have to know before starting if you want to have any chance of success. I'm surprised and disappointed in your teacher that these concepts have not been taught before the start of this project.
Any pin that is an input must have a defined condition. Determining which pins are inputs comes from reading the datasheet. Knowing how to stabilize these inputs comes from instruction and guidance. This forum is here to help, and we certainly have the horsepower to guide you through this project, but it would be much more efficient to get it in the classroom - unless the true nature of the project is to toss you into the pool and see if you can swim on your own. If so, I think this project is a bit too complex for such a scheme. But, onward...
I suggest that you read the Wikipedia page on CMOS. You can skip the device physics stuff (unless that's what excites you), but go through the tech details, logic, and dissipation parts to get a feel for how CMOS functions. Some of it won't make much sense yet but it will eventually, and it always helps to know how your parts think inside. Then make a table for the 4510 listing every pin. For each one, determine if it is an input or output. For each input, determine how it should be treated. Some are easy, such as the clock input - you handle it by driving it with a clock signal. Think through every pin, then adjust the schematic. Using a new part always is tricky, even for experienced designers. It takes discipline to make sure you've captured every little quirk.
ak