I want to open an website about the problems and solutions of us peoples daily life. what should i do. how do i collect info and analyze us market?
Not a bad idea, but.. I am really curious why do you ask us? I would do a search for other similar sites and get ideas from there.. For example a poll is a good idea to start your research!
Use the search term "usa daily life problems", "daily life problems" etc. in Google, Yahoo, Bing, AOL, ASK and other search engines. You will get that you are searching.