Buy these items from www.x10.com web site or the ones mentioned below
IR543 - This device will receive a signal from your IR remote control and convert it to X10 protocol. Therefore, you can turn on and off lights
LM465 - Lamp module: plug your lamp into this module, set the address and you can turn it on or off using your remote control
Wall switches: go to www.homeautomationnet.com or www.smarthome.com for a vast selection.
For your MX700, you need to set up code for X-10 under AUX and assign it to one of the devices. Also go to Home Theater Master forum for more info on how to use MX700 for X-10 devices. Have fun!