Do you want to play and play now? Don't ever post. Wait for the big blind.
If your average session is 9 hands you lose the 5.5ptbb/100 by posting early. My average session is 63 hands, if I consistently posted early I would lose 1.5 ptbb/100. At higher levels where even decent people run 3ptbb/100, that's half your winrate. Not to mention that a lower winrate increases your variance.
so....WAIT FOR BIG BLIND.
!luck