A question about the additional domain and parked domains

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http://forums.cpanel.net – Hello Friends! I wonna ask you I have to change my domain name. I know how to make redirect and change robots.txt But other things I do not know well: 1). Do I have to add my new domain name (which will be the main name) as a parked domain name or as an additional domain name. 2). What should I do with hosting folders? Where do I have to put the files with redirect (.htaccess) to the new domain? Because I need to have redirect from every page of old domain (which is in the search engines database) to the corresponding page on the new domain. (HowTos)