ASK HN: What is your 'partnerships funnel'?

I'm exploring partnerships between startups as a win-win way to grow. Currently, we don't have a partnership manager, so I'm trying to move something.

I mainly look for co-marketing partnerships cause it's the only collaboration I could imagine for the moment since we're not integrable (so, I'm trying to bundle or cross-sell or pixel swap with other products thought for similar targets, etc).

The criteria I use for selecting potential partners to contact is that: - they're at a similar scale compared to us (otherwise there will be no mutual interest probably) - they serve a similar target

What about you? What is your partnership funnel?

How do you: - structure partnerships? (is there a hidden world outside co-marketing?) - select potential partners? (criteria etc) - contact them and propose the partnership?