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i think i can help on question 2
Ok log onto your FTP ( i use WS_FTP very easy to use ) , on there go through your folders thats on your database NOT the folders thats on your harddrive , locate the "theme" folder go into that , then upload the theme u want into that folder. When that is done go onto your site and go into the admin menu , click the "system" button the go onto preferences then general settings once u are in there scroll down the page into u see "default theme" change it to the one u want then click "go" at the bottom of the page , when u go onto your home game u should see the new theme
hope that helps ( it's what i did anyway )