Thanks for your hints. But I have still two questions: 1. Where can I find the old-version of the package. (Since I want to adopt an existing package I think I can skip the steps descriped in the sections 3-6 in the "Debian New Maintainers' Guide" and start with section 9.)
2. I can not use the programs dupload or dput for uploading the package. (My my debian-PC has no internet connection.) So I need a guide to: How to upload a package manually.