also do coupon codes actualy work to get people to buy?
They will use them, if you offer them. Will they buy because you gave a coupon? Probably not. The price comparisons will always be made with all discounts/coupons applied. Coupons can be great to help you track which advertising methods work best though.
do you think this is a good basis to start off on?
Sure, they're some numbers. But there are hundreds and thousands of other hosts offering the same or more for less. You still need to be different in some other way, be it by offering something others don't, by being physically present where others aren't (how many hosts are in your city/county?), by understanding and adapting your service to their specific needs (e.g. musicians, models, chiropractors, Wordpress users etc.)