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A few more details might help.
- create a custom home page (you probably want that) that has something other than the default chronological listing.
- like reprint says, use "pages" for the parts of the site not devoted to member-submitted articles.
- multi-author and author archives are built into WP
- look for "author" plugins to enhance author profiles
- WP 2.5 will have improved tagging so you as admin will be able to edit tags easier.
- get amember pro with the WP plugin if that question was for the same site.
2. Yes, you can choose any "page" as your WP home page. Just poke around the admin interface and you'll find where to set this.