Well, first, we are going with the term portal, as that is what the platforms are called in the Crowdfunding Act.
As for issuers: here is a basic flowchart for how it will work. Sara Hanks (the leading DC attorney extraordinare on this subject, www.CrowdCheck.biz ) has agreed with me on this, though the lawyers in us are itching to load it up with asterisks and caveats, as there are certainly many details not here. But this gives you the fundamental flow. See it also at www.CrowdFundSecurities.com/CrowdFundSecurities/CrowdFund_Resources.html.