Help with static routing, plese

Please could you help me, I would like to move from bridged network to only routed network. Could you help me with settings, this is my scheme:

MK1 is main router, shaper
I want fileserver to be accesible for every PC in network.
On MK1 I am using, QT, PCQ to limit speed/connection, but behind MK2 there are more clients I want to give them some speed, but when I set some speed for ip of MK2 it will be speed they must share. I would like to set speeds for pc behind MK2(but this is propably not possible).
On MK1 I want to limit also traffic from fileserver to all PCs.
I dont want clients to see each other.
Please could you help me to set ips, routing table? I have no idea how to solve this. THANKS A LOT

Setup proper routing and configure correctly all the subnets.

For static routing configure /ip route
On the AP3,

ip route add gateway=<address of AP1> dst-address=<network File server belongs>

The same on AP2

On the MK1,
route to each local subnet,

ip route add gateway=<wireless address of AP2> dst-address=<local_subnet_where_PC_are_connected>