You can drill the tank and add the sump later easily, you just cap the bulkheads. Definately go with a drilled tank if you can.
I would also get the tank drilled for a closed loop, do some searches on closed loops.
You don't need the sump to cycle the tank. But yes, you can run the sump without a skimmer for a while.
When planning your sump, dont put too much flow through it, use the closed loop for the majority of your water flow.
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