I’m a solo web consultant with 15+ years of experience helping B2B manufacturers plan, build, and improve websites that support complex products and long sales cycles.
Read and listen to everything you can by David C. Baker and Blair Enns. This is their beat.
Develop a manual process and take notes. Once you've had a little bit of success, hire a virtual assistant and provide them with a standard operating procedure with the types of jobs to reply to, language to use, etc.
Trying to build technology around an ever-shifting business model is super tricky.
Finding reliable help is also a common challenge.
You should talk to an attorney.
Stripe Atlas could also be a good starting point.
It's low-tech but I'd start at conferences and events. It's easier to build trust face-to-face and you'll have a concentration of like minded people in one place.
From there I'd expand to online outreach via email and LinkedIn.
Partner with SaaS e-commerce and website builders (Shopify, BigCommerce, Magento, SquareSpace, etc).
Web hosting companies are always looking for add-on services to differentiate themselves in a crowded field as well.
Word-of-mouth from clients is the gold standard, but you can also get referrals from your peers.
In-person is great (albeit not super scalable) way to get momentum.
Another good source of leads is to become an "official partner" for a specific provider. This depends on your industry but channel partnerships can be a good source of leads.