I would suggest checking these previous threads on the subject. If you have further questions, don't hesitate to ask...
http://www.finescale.com/fsm/community/forum/topic.asp?TOPIC_ID=32005
http://www.finescale.com/fsm/community/forum/topic.asp?TOPIC_ID=28986
http://www.finescale.com/fsm/community/forum/topic.asp?TOPIC_ID=26746