Normal? When RNG dictates so much, normal is a thing that basically doesn't even exist.

And wow. That is a terrible seed, lol. Yes, Plains is the 5th biome, so getting attacked by enemies from there while trying to deal with biome 2 is certainly rough.

Looking at the map, I'd take the Elder spawn to the south-southwest. Make a small base in the meadows area just north of it, and you can use that as a jumping point straight into those large swamp areas to the east and west of that island, and then deal with Bonemass when you're ready.