The wiki:config page at splitbrain
(http://wiki.splitbrain.org/wiki:config) should answer some of your
questions
In particular look for
(1) - userewrite on config page
(2.2) - wiki:mime page - add file extensions to mime.conf to allow
them to be uploaded
(3) - there should be very little to do to configure your webserver to
run dokuwiki. If the webserver meets dokuwiki's requirements and has
usual settings, dokuwiki will run. There are pages with notes for
particular webservers at splitbrain, try searching on the name of your
webserver.
Cheers,
Chris
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