Someone on Solotripping or Waterwalker (now defunct) had posted their experience with exactly this, pictures and everything.  I tried a quick search on solotripping, couldn't find it.

From what I remember, your 1" flat fell & rolled for the edges is what was done.  Taped seams.

Tie down points at the 1/3 marks. 
Three ridge line points that are mirrored on both sides of the tarp - I like to tie a cord under the tarp to hang stuff from.  Dead center & 1/3 points.

Practice your seams.  :D

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