Public IP subnet setup help

Dear,
I have received a set of ip from my ISP and i don’t know how to setup in RouterOS, Any one can help ?
They said i have to do a static route to 61.244.212.124 and setup the 128 ip subnet in the router,
i am very new to mikrotik, any one can advice how to do it ? Thx !


61.244.212.120 ~ 61.244.212.127 (8) (Their router network)
61.244.20.128 ~ 61.244.20.255 (128) (My own IP network)

61.244.20.128 (TYPE: ROUTER_NETWORK)
61.244.20.254 (TYPE: GATEWAY)
61.244.20.255 (TYPE: ROUTER_BROADCAST)
61.244.212.121 (TYPE: GATEWAY)
61.244.212.124 (TYPE: WAN IP)
61.244.212.127 (TYPE: BROADCAST)

BB GATEWAY:
61.244.20.254
61.244.212.121

SUBNET:
255.255.255.128
255.255.255.248