I second Smokey's advice. Steve Jobs was a lying, scheming, double-crossing, egotistical unpleasant bastard, and that's the last thing you need.
The only advice I can offer, comes from my own business failures in the distant past.
One: never sign any exclusive distributorship agreements, ever, and especially not in return for nebulous benefits. In my case that mistake killed a great product (back in the Apple II days) when that guy (who I was friends with) totally failed to do any effective marketing, either international or local. I'd though the same as you - "I need someone more extroverted and gung ho." Didn't work. I should have done it myself.
Second: Never give up control, of a business you created and in which you are the essential technical driver. You say you want a 50% partner, but has it occurred to you this person will then have a say in what future products you develop? And by definition, he'll be much less technically informed than you.
This factor killed another venture I was involved in - a partnership, in which my partner did bring a lot to the business, but was ... how shall I say it? An idiot? Ha ha.. well not really. But it was most frustrating.
Edit to add: Oh, and 2016 is probably a terrible time to try and start up in a field like protocol analyzers, that depends mainly on corporate investment in test equipment. Perhaps as you've been busy with your work you haven't spent much time reading economics news lately? To summarize: in 2016 the world appears to be sliding into a new financial crisis, predicted by many to be much worse than the 2008 events. I'm sure no one here wants to read a long discussion of why. But for you, I'd suggest spending some time reading sites such as
http://www.zerohedge.com/Perhaps you might consider staying in 'small, surviving' mode for a while more, and use that time to build your business networking skills, till it's clearer how the economy will go?