Hi niana, someone else can help you better than I can but for now:
Posts are only posted onto one place--for most blogs that's the "opening" page of the blog, the homepage. They pile up there in reverse chronological order, newest on top.
Pages are not for posts, each page is kind of like a post in itself but outside of the date-ordered regular posts, they are static meaning nothing is automatically added to them. You can go in and change them, of course. They are usually accessed by tabs in your menu, also links in the sidebar and they are used a lot for background info, but you can put anything on them.
Pages are not announced to subscribers or in feeds, they are sorta "dead" that way. You can make a static page of info be your front page that people land on when they go to your blog, which could be good for first time visitors, but can be boring for returning readers, they may not persevere and click through to get to the current, changing content (which is what repeat readers usually want). At least that's what I've read.
I have a how-to blog, and what I've done is to have as index page of links to the tutorials, (which are all in posts, not pages, or my new ones wouldn't get announced to subscribers). Also each post can have one or more categories assigned to it and all the posts with the same category will come up together on a category page that can be one of your menu tabs. So theres no need to file each post on a separate page, which you cant really do anyway. You don't have to have them all show in their entirety on the homepage, they can show as a summary that the reader clicks on to read the whole post...
These forums have previous answers that cover all of this if you search and you will get better info with links to WordPress support info (check that out it's under help in the dropdown to your name, upper right side of the toolbar)
Good luck with your blog!