I am thinking, since I'm not a webmaster I need to hire one, but do you guys have any idea how much would it cost me?

To hire a webmaster is no any cost. i am a webmaster and if you have any query regarding site optimization feel free to PM me.

The cost will depend on your requirement. There are lot of packages and methods to hire a webmaster.
1. Hire for a monthly payment
If you are hiring someone for monthly work, you have to negotiate a fix price with him. If he is from countries like USA, UK you will have to pay higher amount. If you hire someone from India, you can even hire a person for $300 per month. But think about the quality of work also. Not only going for price.
2. Hire for hourly Work
Here you pay hour. You must have  an idea what amount of work a freelancer can compete for hour. If you are hiring from India you can hire a person for $3 per hour.  If you are using freelancer site like ODESK, you can eliminate the risk of outsourcing for  a bigger percentage.

its totaly depends to your target work how much work you want for a webmaster and which quality work you want.

@Candice; Well to give the benefit from the doubt, webmaster's price usually vary from the place they're working, if you will hire US webmasters it'll cost you a lot of money but if you hire webmasters online like Filipinos and Indian nationals, I can guarantee that you will not only save money but also they are capable of what the American are capable of...