Firstly, there are many more experts than me in this field.....an hour or two looking round youtube wil def help with technique.
A liteweight braid, 10lb fluorocarbon and I only use BM jigs around the 2.5 or 3.0 size at this time of the year. Look for shallow weedy areas, the clearer the water the better. In the boat, I target them in the daylight hours.....the less wind the better. If overnighting, a spotty on the back of the boat can help as can any light source from other means....e.g. A house on a hill! Tidal flow should be minimal and stage of tide of no importance I find. If there are two you and one hooks one, a slow retreival will often see a few following the one hooked. Get your mate to then throw his jig at the 'followers'. Once hes hooked up, get him to hold it there whilst you deal with your one then target the followers around his jig. This 'raid' can often catch several squid in a match of minutes. Like I say, am no expert but this seems to work for me :-)