I think before you can really pick a partner, you need to think very thoroughly about what you're very strong at, and what you could use a bit (or a lot) of improvement at. For so many people, it's hard to be willing to identify what you are not so great at doing. Sometimes it's just a matter of admitting it. In other cases, you may actually struggle to determine where your weakest points are. Then, once you've done…
In other words: If you're good at web design and programming, then perhaps you want someone who's more business and idea focused. This person would need to have some connections too. Otherwise, if you just don't like doing the design portion, but you really like to code, then find another entrepreneurial minded person who like to design.
I owned www.PSDtoWP.com - so I'm quite compitent. It's just the decisisions..
Do I want: - A designer - A coder - Someone well connected, or versed in device peripherals - Or another good PR / Marketing person (This is what I'd call myself)