Your questions are hard to answer because they are so open. First you need to do your homework. Do you know if your product is going to sell? If it is then i would suggest you start small till you get a better idea about business, then you can start to bring in staff. As far as it goes for traffic you can do ppc with facebook, google and many others.
There are a number of sites available online, that give away Daily deal affiliation. You may Google about it. Some of them pay decent margins. If you want to make your own clients then you have to contact different companies by your own,
Before you ask how many members of staff you will need you must have something to sell, if you dont have any deals at the moment then there is no point in hiring anyone. I agree that you need to do your homework on this first to see what people really want to buy and what would be succesful on a daily deal website in your area. I Do think you should phone around local buisnesses and arrange some meetings to discuss the discounts they could offer for your site. Start getting your deals together and creating a list yourself before you hire anyone, you need to be making money in order to pay your staff. It does sound though you have got the coding side of your site sorted you just need to understand your market a bit better.