Two principal ways to go:
Evolutionary principle - do it slow one little unperceptible step at a time
The evolutionarye principle is best described by the Ramform
It consists in having a seastead that can grow like a living organism a real estate squaremeter per day - at no time outside observers get the impression that “something radical is happening” - the interference level for such projects is low - http://concretesubmarine.activeboard.com/t56351996/business-and-third-party-interference-freedom/
The evolutionary principle implies that todays Marine Business is Tomorrows Seasteading as sustained in this thread where the theory that marine business will lead to Seasteading is sustained: http://www.seasteading.org/forum-list/topic/marine-business-will-lead-to-seasteading/
Singularity principle - do it fast create a project that splits history in two.
It is like the “big bang of seasteading” everybody will talk about it, it will be a “historic reference” it will kick off a new way to do and see things. Intents to create this singularity where “Freedom Ship”, Blue Seed, etc…
As those examples (and their failure) show - it is not easy to create that Singularity a lot of upfront money is needed. The singularity principle is best described as kick off Seasteading