Having been involved with technology-based startups for almost 20 years, this is probably one of the most important questions - who should be co-founders? Considering this is your business, you need to be comfortable with the co-founder you bring on board. In my opinion, the key characteristic is trustworthiness. The co-founders of my previous ventures have all come from my network - people whom I've worked with in the past. That way I know their personal traits as well as their technical capabilities. If this isn't an option for you, then here are some possible places to look:

1. Co-Founders Lab - check to see if there's a Co-Founders Lab in your area.
2. Local technology group meetings - depending on your technical needs, attend appropriate local meeting such as those with IEEE (electrical engineers) and ACS (chemists). There are technical associations for almost any technical discipline so find out what is available in your area.
3. Local Universities - if you are located near a research university, then you may be able to find someone interested in startups there.
4. LinkedIn - you can search for people with the right technical discipline.

Regarding attracting or convincing someone to be a co-founder, this should be secondary to you being comfortable with the person. Each person will be different regarding their comfort level in joining you. Some will want a certain salary, some will want equity, some may want autonomy, etc.

Good luck with your new venture. Feel free to follow up with me if you need any further advice on attracting a technical co-founder.
Gareth.