1) Partial sunlight but no prep work
2) More sunlight but i will have to clear a lot of underbrush.
if I were you I would go with number 1. We decided this year to clear and area, and now we are seriously regretting it due to increased enforcement and detection. Ever with hampered light when we moved them into a bit shaded area they are flourishing so don't worry.
as far as soil, swamp muck is filled with organisms that could potentially harm your plants. We carried nigh on 800 pounds out there. It sucks and its a bitch but it was worth it. Make multiple trips and don't pull a muscle