Self-certification on form 8996, but you must be sure it is complying with all requirements.
Answers
You would never want a C Corp to be a fund; that would destroy the tax benefits. LLC or Limited Partnership is optimal.
It's simple: the corporation need only file IRS Form 8996 with its initial IRS Form 1120 and follow the instructions to fill out the form. If you need help with filling out the form, consult your tax advisor. As far as the ongoing compliance, that's a much longer story requiring a lengthy conversation with your tax advisor.
It's self-certification by meeting all the requirements. Must have 90% or more assets as qualified Opportunity Zone business property which must be within designated Opportunity Zone.
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