From: someone
what is going rate/sq m on beach front residential property?
Don't know... but that's not the only factor.
Other important factors :
1) how much time/effort you spend personally managing disputes between neighbours and otherwise helping out running the sim.
2) the theme of the sim (the more themed the sim, and the more work you go to in order to find compatible people to live there, the more you can charge, as a rule of thumb).
3) The zoning of the sim (resident/commercial).
4) The lag (or otherwise) of the sim.
5) The location of the sim on the grid (being next to nice neighbouring sims is good).
6) Who you have running your sim with you.
From: someone
should i sell it as commercial?
Up to you.
Commercial sims to have fewer but bigger parcels, and be much higher lag.
Personally I would suggest waterfront -> residental... as residences tend to value waterfront enough to pay more for it in the way that stores tend not to.
From: someone
i want to have some sort of contract to make sure that the land tier is always paid. any ideas/suggestions?
IM me inworld, I'll give you a copy of my contract I use for my residents after I finish writing it (I aim to finish updating it today, in time for 1.12's release so I can set it as the covenant).
From: someone
what size plots should i split this island into?
Personally I would suggest a 1024 minimum for residences (you don't want a bunch of newbies on your island), and a 2048 minimum for commercial areas.
Of course, the most effective way to know is to ask your prospective residents what they want, then give them that
