@FinalDresdonation divide labor, specialize in a particular commodity/sector, establish a free market/ trade with other colonies, create a militia/military and then setup the responsibilitism system where only net tax payers and people who are subject to conscription/draft get to vote. To answer your question the first thing we do is fortify the area and obtain resources, I’m thinking step by step.
@I_AmTheKnight I'd think become nomads until we find an essential resource or commodity we can use. Mad Max style settle down somewhere, get the water, and own it all from there. I'll handle the water.