Bandwidth management

Hi

I have a mikrotik rb1100 and a 2mbps of bandwidth from my provider connected to eth1.
I have 2 nwtworks, wifi and LAN. Wifi is connected to eth2 and LAN conncted to eth3 and eth4.
I want to share the bandwith withing this networks as follows:
800kbps to the wifi network (eth2)
And
1.2mbps to LAN (eth3 and 4)

Kindly help on how to configure this please

Thanks