Well, this is the whole point of the design project. Don’t forget to keep up with the subnetting as you go.
You should research each piece of equipment you want to use, as this project is designed to test your equipment knowledge and reasoning behind your use of the equipment, all devices have strengths and weaknesses. Your selection of device is dependent on what it is designed for, and whether it fits into the schema.
I am willing to give pointers to individual problems, but if I do the work for you, you will find it much harder to do it in a work environment.
When I was doing my CCNA I found it more productive to bounce ideas of other students. You will get a bonus doing it this way as you learn to work within a group of peers, and your individual weaknesses will be strengthened. You will learn from each other.
Good luck, and don’t be afraid to make mistakes. I made loads, but, thankfully, not as many in the work place where the hard course work paid off.