Once you have all of your settings ready, you need to prepare for making your system live:
Decide if you need training by an outside service or if your staff can do the trianing themselves.
Make sure that there is time for your staff to play with your test system and get comfortable with it
If this is a migration, work with your previous company to extract data right before you go live
Come up with URLs for your new Koha OPAC & Staff Client
Make sure that if you're hosting your own system you have a backup plan