if what u mean by the driver circuit is not the mosfets and bybass diodes which will be connected to the solenoids then i have no idea of what drivers mean.... if it is what u mean then there is no problem with the drivers ...... the problem is with the shift register stuff..... how can i program multiple outputs on one pin? that's what i meant by question number 2 
and by the way maybe the use of mosfets not the best idea therefore we are planning on using solid state relays