As you look for the right writing partner, look for someone with similar sensibilities to your own. Do you want to tell the same kinds of stories? Do you share the same writing goals?
Your ideal co-writer might be right under your nose—or right next to you in bed, as several teams revealed during our interviews with Claudia Johnson & Matt Stevens for Script Partners: How to Succeed at Co-Writing for Film & TV.
Most TV shows are written by staffs, so they're not actively looking for new scripts, writers, or story ideas. But that doesn't mean they never take submissions.