Finding good salespeople can be difficult. 2 basic schools of though exist:
Nature; a natural born people person that can easily lead people to an objective. Self motivated.
Nurture; any person that can be trained with training programs and nurturing.
You want #1, which is a natural born sales person. I've had very smart people work for me that simply could not take any amount of training and translate that into a successful sale career.
You can place an ad on career builder but I've found those to be less than stellar applicants. Recruiting works best. Look for them where ever you go and consider referrals to be the highest quality prospects. When you here someone say, "hey my brother in law would be great at that", get the number and call him/her that may be your sales person. When you get a waitress that has a great outgoing personality, ask her if she would be interested.
Many other things go into it. They have to be honest, dependable, etc., so you will have to vett them for all that as well.