With the traditional pole set up (yours) the conduit pieces drop over the "nails" that tack down the bottom of your tent at the sod cloth juncture and then they have the eye "bolt" assembly that drops in fromthe top end, you need the nails stakes for that particular aspect of the set up. I like the nails and use them for lots of different things (so I have bought extra).

HOWEVER, when it comes to the stakes that the guy ropes tension against, I like some choices.
-- soft dirt, 12-14" plastic stakes
-- medium dirt, 6" plastic stakes
-- hard dry dirt (or lots of rocks): steel nails at 45 degrees so the rope won't slip off.
FYI, you can't have "too many" stakes on hand.

Poly tarp beats nothing for a rain fly, I've done it, but an ember WILL burn a hole thru it in each spot it touches.
If "lightning strikes the same place twice," then .... well.... somewhat problematic --- did you get the fire-resistant treatment?

Very important is to put down a poly tarp floor (or better) and "nail" it down with landscaping staples (watch out for your sod cloth, though).