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Thanks in advance
Do you already own a website? If not and this is your first then I wouldn't worry too much about hardware/bandwidth as you'll probably not use your hosting anywhere near to its limit for quite a while.
Most people seem to start out with basic PHP hosting and a database or two, with bandwidth being around 5gb-20gb.
If you need any more info, please explain your web developent background and what you're looking to do.
The long answer is, if you figure a page is 50K in size, and you serve 1000 pages a day, then you need 50,000k a day - so 50megs of transfer. 30 days in a month, you need 1500 megs of transfer. Or 1.5gigs a month. See? Any old hosting plan out there will do that level without blinking. And 1000 pages a day is plenty for most sites out there. Now throw in automated compression and you're probably down to 1/2 a gig a month even at 1000 pages a day.