Can I use Airport express as a router or wifi modem?

I'm not good at IT. In fact, i know very little or nothing. So please, do not get annoyed at my stupid question?
The situation is this: I have a MacBook as described below, and a DSL cable connected straight from my laptop to an Ethernet port provided in my room, not through any modem. I'm living in dorm, so that's how school provides dorm students with internet connection. But sometimes, i've got to stay up late and search for information, but the connection automatically drops since it is "light out" time. Now i' considering buying an Airport Express ( or maybe Airport Extreme) to create wireless network. I really don't get how to set it up or how it's gonna work for my situation. I don't have any modem or router around. Can anyone explain the real function of Airport Express? And if possible, can you please tell me is it better for me to buy Airport Express or Airport Extreme?

True! I know that i just need to connect that cable from my laptop into the Ethernet network port. The situation is sometimes i need to stay up late to study but don't have connection past 11:30 (light out time, no more connection). And sometimes, i want to go somewhere else and use wireless network where there isn't one available. For example, my friend's house. I also want to know how the set-up of the Airport Express helps me create wireless network. Do I need a modem or a router to connect Airport express to or else? after setting up, do i need anymore DSL cable or so? Does Airport Express itself function as a wireless access point? One more question: if i set up my wireless connection in my dorm, but later i unplug the Airport Express and go somewhere to plug in, will it still work, or i have to set-up the network again?
I'm not really into network, connection, router or modem much. I don't know much about this stuff. Therefore, i have quite a lot of question. Sorry and thanks for replying me.
Another problem that arises for in your reply is that, school network is administered by staffs of IT department. If i have to to connect my wireless network to school's cabled network, i think i've got quite a lot of explaining to staffs to do. . Anyway, thanks so much for your information.
Message was edited by: haiu2323
Message was edited by: haiu2323

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