the router should be full-duplex 100 or auto-detect, you configure the switch ports individually, if the devices that are connecting to the switch, ie pc's servers etc have 100 meg NIC cards then you config the switch to that speed, if only 10 meg config to that, try not to leave auto detect on as this can cause a problem, you need a xover cable to connect the 2 switches together and they will talk to each other on 100 meg.