I trade on think or swim and I mostly use vertical spreads. I am new to this but when I was paper trading on think or swim, I usually put my vertical in as a limit order at the midpoint between bid and ask. I got plenty of fills doing that with paper money, but now that I am trading real money it seems that I never get anything filled at the midpoint. Since a vertical has a limited profit potential it is very important to get a good fill, I would think. Should I be looking for verticals that have a tighter bid/ask spread in order to get filled close to the midpoint? What about buying the long option first then waiting for the underlying to move closer to the short option before selling it, in order to get a better credit on the short option? Is legging into a vertical a good idea? What method do you more experienced guys use to get good fills on verticals?