Since you don't want any of the existing data I think the best thing at this point would be to either use a new clean db or delete all the procedures then all the tables and let it do a clean install.
Regarding the dbo issue, I would restore all the original scripts and then just put this in your user.config:
<add key="MSSQLOwnerPrefix" value="[dbo]." />
replacing "[dbo]." with "yourdbuser." or possibly just an empty string "" would work just as well or better.
The system will replace the [dbo]. with whatever you place there before it executes each script.
Hope it helps,