how to configure modem and miktortik

i have internet with modem Model:Thomson g520
and i want to connect Modem in miktorik and make router for more computers but my Mac from lan-card is Registered to mu provaider and static IP :
172.17.0.50
255.255.0.0
172.17.0.254
how to create this thx and router Computer is Pentium 2 20gb hdd 512 ram ,is good configuration ,and 2 lan cart ,eth1 and eth2

I think you can connect your modem to the serial port of the router and create ppp dialout connection, give the ID and Pwd given by the internet provider, Give the static IP to ether1 and from ether2 you can share the connection.