Bug#295248: tex4ht: interested in providing a patch for the upgrade
You probably want to look at http://www.debian.org/devel/
and especially http://www.nl.debian.org/doc/maint-guide/
there. Be sure to fully read that document before proceeding.
Don't discard the last section of it, suggesting debian-mentors
for seeking guidance while working on your first .deb, as well
as for a sponsor to authorize the package you upload (needed if you're
not a register debian developer).
Good luck and thanks for your effort,