I have a 1998 s10 and want to add a power driver seat what is the best place to pull 12 volts from

Is there a connection already there? Does it have power ? If one is there and no power present then it may be missing a relay. A power seat usually runs through a relay because of how much power it takes. If nothing is there then you will have to make your own circuit. Be sure to install a relay with enough power and you can activate it with the accessory power. Also be sure to include a fuse or circuit breaker as part of the system.