Add B2B sales to an established B2C company and hiring sales?

I have an established B2C focused business. We do well in SEO so we have some B2B inquiries come organically, we listened to what they need and made some products for them that sell well when we get organic inquiries. We even partnered with some other B2B focused businesses to be distributors for their products as it pairs well with our existing products. The problem is, I don’t have much sales/lead gen experience in B2B, my experience is more with SEO, paid search, social media, and content marketing. Paid search hasn’t worked so far for my B2B verticals (low volume). I have the budget now to hire a sales person or try some campaigns, but I’m not sure if that’s the right move or how to go about hiring the right person. I’ve heard you shouldn’t hire sales until you’ve established a sales funnel that works already. Any advise on starting out with B2B? I could probably buy some prospect lists and start cold calling, but that seems a bit, dirty? The potential revenue based on my research could easily match or outpace our entire B2C volume, and besides sales, we are completely set up to deliver the products with low additional overhead so it seems like a waste not to pursue it. If I do hire, I know B2B leads can take months to close, so I’m not sure on how to judge any new hire’s performance in an unproven process. see hubwealthy.com/wealthy