You cant just pick a site and say "how much would you charge for this". I dont know your capabilities with photoshop. I cant tell wether you use front page, or if you code in notepad. Everything depends on your abilities.
Most web designers charge by the hour. I set up an 8 hour initial package where I do 8 hours worth of work for the price of 7 hours. Then I charge by the hour after that. If you do such a thing, you have to be careful that you get in and get to work. 8 hours is almost always enough to get at least the front page up and probably a few other pages.
Your biggest problem now is that you have no idea how long it will take you to do the work. When you work with businesses, you need to have an idea. They will want a quote. They will want you to tell them how much it will cost up front and you will need to be very close to the quote. If you bid high, you lose customers. If you bid low, you work for free. These are things that you have to learn over time, its not something I can give you a google link to.
Also, if you do not intend to be around to offer support for your websites in the future, I wouldnt even bother. If I have a customer come to me with an existing website wanting support, I normally tell them that the initial fee for my services will be quite high. Thats because I have to figure out what the other guy did. Especially if the first guy used frontpage or dreamweaver. That is a lot of code that needs to be fixed.
Any new customers I get will be hosted at GTGHosting. They have excellent rates and top notch service. I know the owner, so I can say this with absolute certainty. As a web designer, I recommend that you do not
offer hosting service. Tell them that you design the website, but they need to work with this other company for hosting. Itll save you a ton of hassle. When you meet your customer, take along a price sheet from GTGHosting or another business and tell them you recommend this business. Let them set up the account, or you set it up in their name. The bill goes directly to them and gets sent directly to the hoster. You dont have to mess with it.
Starting your own business is a huge step and it is not something to be taken lightly. If you take on this "business" as a summer thing and make mistakes, itll ruin your reputation. When you get out of college and want a real job, it may cost you.
As has been said before, freelance for another company. Get your feet wet without having to put your head on the line. There is a lot more to having a business with business customers who want things exactly right for exactly the right price.