I really need someone's help with this one

Hello, I really need help making a network. I won't have to do this on real hardware, it is all theoretical. Everything is translated to english from google translate. Here are the things that I need to do:

1. Calculate the following parameters for each subnet (described in the diagram):

a. Network identifier

b. Network mask in decimal notation

c. The first available address for distribution

d. Last available address for distribution

e. Broadcast address

1. Determine the IP addresses of the machine network interfaces (where it says "Specify number", write down the interface number from the diagram, eg "E1" will be "ether1"):

a. MT-HQ Client-facing Interface (Specify Number) - Available Address1.

b. HQ-WEB - 5th available address.

c. HQ-DNS - 6th available address.

d. MT-HQ Interface Against Servers (Specify Number) - Available Address 1.

e. MT-HQ Interface Against ISP-RTR (Specify Number) - Last available address.

f. ISP-RTR Interface Against MT-HQ - Available Address 1.

g. ISP-RTR Anti-MT-BR Interface - Address 1 Available.

h. MT-BR Interface Against ISP-RTR (Specify Number) - Last available address.

i. MT-BR Anti-Server Interface (Specify Number) - Available Address 1.

j. BR-DNS - Address2 available.

k. BR-WEB - 3rd available address.

l. MT-BR Client-facing Interface (Specify Number) - Available Address1.

1. Why won't my clients be assigned static IP addresses?

2. Why are servers assigned static IP addresses?

3. Why do I need a static IP address for the router on internal networks (intranet and DMZ)?

4. Write commands to set all MT-HQ and MT-BR IP addresses. Explain commands.

5. Write commands to change the router identities to those on the chart (MT-RTR and BR-RTR).

6. Write a command to create a user named 'manager' with full rights to manage the machine.

7. Write a command to delete the admin user.

8. Write a command to set the password for 'Password123' for 'manager'.

9. Write commands that would be required to turn on a DHCP server on the client network (both HQ-RTR and BR-RTR) to distribute the entire range of addresses available (except the address already assigned to the router). Specify the ISP-DNS IP address as the DNS server. Domains - hq.lv and br.lv. Gateway: The IP address of the router's network interface that is directed towards clients. Explain commands.

10. Why won't clients even communicate with the ISP-DNS server?

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And the scheme is here: https://imgur.com/02jOP1V

I'm really struggling with this, I hope someone can help me, I'd really really appreciate it!