Anne, i ran across this site doing some research. Might be a possibility. PrioriLegal.com says its for startups in NY who need quality legal work at (mostly) fixed fees. https://www.priorilegal.com/ AVVO.com is one place to find lawyers and get some semblance of customer feedback.
Here's an interesting article on the subject of disrupting the legal profession. There are some interesting business models popping up that you might be able to leverage.
In terms of vetting:
1. My first question would be "do you do fixed fee work"? if not move on. there are plenty who do.
2. ask to speak to references - other clients like you.
3. Resist paying retainers.
4. negotiate the terms of the representation agreement to be sure you don't get stuck paying for subpar services.
5. include terms that allow for deferred payment or contingent payment.
For the mundane contracts work (partnership agreements, employment agreements, NDA, IP, etc. we search online for docs that fit our needs then ask our firm (Apex law group) to review and tweak. You still need to nail down the parameters of what you want them to do, but have a head start. this doesn't necessarily mean the document(s) you start with will come from a LegalZoom or RocketLawyer or LegalDepot, but it may be a doc that was filed in a court or otherwise available online. then ask your firm/attorney to customize it to your needs. In the startup world it's tempting to dish this stuff off to the lawyers completely, but you, as CEO, need to take the time to understand the details and implications of each agreement/contract anyway so as painful as it may be it is worth it in the long run.