apt-get install dpkg-dev

To create a per-package-repository:

cd <pfad>/debian/dists/testing/<programm>/binary-i386
dpkg-scanpackages . /dev/null | tee Packages | gzip -9 > Packages.gz

Edit /etc/apt/sources.list

deb http://<server>/debian testing <programm>

To create one big repository:

cd <pfad>/debian
dpkg-scanpackages -ai386 pool/main /dev/null | tee dists/unstable/main/binary-i386/Packages | gzip -9 > dists/unstable/main/binary-i386/Packages.gz

Edit /etc/apt/sources.list

deb http://<server>/debian unstable main

dpkg-scansources pool/main /dev/null | tee dists/unstable/main/source/Sources | gzip -9 > dists/unstable/main/source/Sources.gz