welcome brother to the ranks of the Daemonhunters. Be warned do not rely on the grey knights for long. they are great warriors and models but they truely shine when deepstriked into the enemy lines. take plenty of stormtroopers to lay down covering fire. they have a good range and just as good bs.
heres key thing with Grey Knights use cover like no tomorrow. get them into combat asap and make sure you pack some antivehicle near every troop of greys.
it sucks alot when a dreadnaught charges your men and you cant damage him because none of your stuff can pierce his armour and your men are locked into combat because they are fearless.
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