1)What is 'Boy's Home'?
2)What are "water coolers"? A box that provides chilled drinking water? If so, actually my son's private senior high school doesn't have them. At most senior high schools, there are vending machines selling drinks including bottled water, and students prefer to drink from that. Otherwise, if there is a cafeteria, there is something like a water-cooler. I can't recall calling it by any special name though. Otherwise, they are free to brink a thermos from home.
3)What do students do on their first day of school? On the very first day for a Freshman? They only have a ceremony. Usually the same for the first day of a new semester (term).
As for books, in Japan, text books are renewed every school year. For example, this year's Freshmen's books cannot be used for next year's Freshmen, and this year's Freshmen will be provided new text books when they step up to a new year. I think most students bring only the books they need for that day's class. But there are 6 classes a day, so depending on your schedule, you end up bringing loads of books (often plus their lunch and their club activity tools).
4)The lunch break typically starts around 12:30pm and lasts for about 50 minutes. I think that in most schools, students are free to eat anywhere inside the school, which will typically be a bench outside or a lounge or cafeteria where they will join those from other classes, or their own classroom. Teachers eat seperately.
5) Why can't students celebrate Feb 14th if school starts in April? You didn't think we have vacation during January to April all the way, did you?! Please refer to the answers on your previous question for more details on annual schedules.
6) After graduating, the students are expected to get a job or higher education which would typically be a technical college or a university. Of course, not all students are successful on doing that.
Rae, if you have any further questions on the same issue, you should click "post" and add a message to the same thread, so that it will be easier for people to know the history of this question. For reference, your previous question is as follows;
http://www.japan-guide.com/forum/quereadisplay.html?0+41944