Because the community is so small in general at the moment, that shouldn't be too much of an issue, but in the future it might require more as more people join the site. I would recommend feeling everything out a little bit before jumping right into creating a tribe, but right now I doubt there is much harm in going ahead and doing it. You can also add mods to help with taking care of a tribe as well in the event that your tribe grows really quickly, and you can always hand off the tribe to someone else if it becomes too time consuming for you.