I think there are some of those conversations happening on SMB Twitter. You may find them helpful. At DueDilio, we have a few case studies in our KNowledge Center but they're more relevant for due diligence.

-Legal: outsource to someone with experience in transactional law and preferably in the industry your searching in. In-house and/or legal templates are the alternative and I would highly discourage both avenues. A different lawyer (potentially from the same firm) would likely work on legal formation, operating agreements, subscription agreements, etc.

-Accounting: QuickBooks online account and a dedicated credit card/checking for expenses should do the trick. I think it would take me more time to outsource than to track expenses but perhaps you can find a reasonably priced bookkeeper to justify the cost. If you have employees, outsource payroll processing as well (Gusto, ADP, etc.) and digitally link it back into QB.

-Tax: Outsource. Find another SMB that can grow with you over time. I would also opt for a firm that can handle your personal returns and coordinate on legal structure with your lawyer now, as opposed to after a taxable event occurs.

-Administrative: I would invest in automating your admin work via online tools (scheduling, project management/flow, CRM for non-broker search, etc.). Interns are another avenue but you can't rely on admin/interns for most things - it's going to require your attention/decisions.

I think there are likely many people looking for solutions to what you're asking. Ultimately, it would highly depend on your preferences, resources and circumstances. Don't think you're going to find a "one size fits all" case study to answer these questions for you.