I did something similar to get people into MTG and i must agree with the above post whos name i have forgoten
Want people to play something new that they`re marginally afraid of?
Make it fun, easy and falvorful!
Most importantly, if you play against them, you must lose

Not by a long shot but you must lose.
If they play against themselves make even armies
Don`t insisist on the rules that much
Be all like, now you can move this much, those guys can shoot those guys, you need to roll that many dice, you need to score that much and so on
Don`t explain the whys and hows :P but if you do, do it briefly
