Internet - Router - Mikrotik - Switch - Clients

I am new to MT and I want to do the following:

I have a broadband internet , then it is connected to the router TP-link. I want to connect MT to a router. Then from MT to a switch and at the end to a cilents.

MT is 2.9.50 OS, having just one Lan (rb112). Do I need to add a vlan interface? Do I need to use DHCP on MT or it can be done without it?
I also want to add simple quee with ip adresses so I can control bandwidith usage on local clients.

Can anyone help me with step by step explanation with some examples please?

Thank you!!!