I would not take on a co-captain if you decide to do this. Having someone else involved increases the time burden and communication issues too much.
If you are good at organizing things and have decent people skills, you will be fine. Just send out email to gauge interest, recruit via email, make sure the team is big enough, make your expectations clear.
I have captained continuously since 2006. Despite the work, I like to do it because I know there will be one team that will run just as it should. Even if my other teams don't work out, I can get plenty of match play on my own team.
-- Random Error Generator, Version 4.0
-- Master Moonballer