Post installation

I've searched on every term I can think of, and while I haven't found a similar question, I'm sure someone has already asked this.

The gist: I'm using AcidFree, which I like, for a gallery. I want the thumbs to be accessible to everyone [anonymous] but to view the larger images I want the user to be authenticated. It seems to me this isn't a node access problem, because the restriction is in the directory structure. (Filemanager stores private images in a private directory, and AcidFree writes the private images and their thumbs into that directory.)

How do i customize the home/front page content of the drupal installation?
thanx, Caleb

How can I change the Pushbutton theme that was setup during installation via Fantastico to the Bluemarine or other themes?

I've tried to change it in the Administration/Themes
but it defaults to the Pushbutton.

Thanks,

how do i add "locality" during user's registration? is there a module for it? thanks

for example, like in drupal.org when user registers it asks where you are from?

I am trying to figure out how i can allow non logged in members to view my created pages "nodes"?? how do i do it?

i'm having problem IMAGE margin.
i have already set in .CSS 0 margin and 0 padding, but somehow when i set background color to check, I still see the background is bigger then he image.

this is what i have in CSS

.image {
margin: 0px;
padding: 0px;
border: 1px none #333333;
background-color: #CCFF99;
float: left;
}

is there something i'm missing?