do not give them the 29.95 per month this will not help you establish credit. you don't want a horizon charge card, if this card doesn't come in a visa or mastercard credit card version skip it.
I would suggest a major department store in your area that has 3 or 4 stores like JCPenney, Sears or Macys but not Horizon.
Horizon sounds like QVC or HSN. you wouldn't want their charge card would you? their Mastercard would be acceptable but they don't have one. You should consider a good secured card like this.