u/Banana_god_69

I'm a brand new player and want to get into playing warhammer with grey knights ( cause they look cool af and I've heard there decent ) and was wondering if just buying 3 combat patrols made a decent army. I added up the points and it's roughly 1950 which isn't far off 2000 and it has quite a variety of units. I'm just wondering if this is ok or if I have to look at buying loads of boxes separately.