Should I do adjustments to my hammock to make it lighter (O rings, dutch clips, or anything else)?
You have lots of studying to do when it comes to modding your suspension
with O-rings, Dutch Clips, etc. Truthfully in this regard you're not modding the hammock but the hammock suspension (a hammock mod would be for example adding a footbox on a gathered end hammock). So modding your suspension depends on which suspension you get when you get your hammock.
Should I use Snakeskins on a Black Bird?
You could use snakeskins but I bet most of us who use a BlackBird just use
the Bishop bag that comes with it.
Carry neoair, or save the weight?
I've got 2 neoairs, tried both in the hammock--not for ME, just too narrow
and I get CSW=cold shoulder wrap.
Do i need a underquilt now, or can I wait for fall?
Depends on how cold YOU get, how cold it gets outside where you are.
What type of underquilt for ohio fall/spring weather?
See above, I think it is still quite a bit chilly in Ohio, give us some
temps you'll be hangin in so we might make recommendations.
Can I tie my tarp to my suspension webbing, or just to a tree?
Most of us suspend the tarp from tree to tree independently of the
hammock-that way when you get into the hammock (it will pull down some)
the tarp will stay taught.
Good questions-keep 'em coming