First write down your top five disliked tasks; you know, those mundane, time consuming jobs that suck life from you. Of course, exercise discernment here. Wasting your robot slave on tasks such as dressing you or brushing your teeth smacks of laziness and may breed contempt in your minion (robot contempt ain't pretty; seen 'I Robot').
For me the tasks might be: 1.mowing the lawn; 2.emptying the trash; 3.loading the dishwasher; 4.vacuuming; 5.doing the laundry. (actually, I don't do the laundry, my wife slave does, but you get my point). Determine which tasks share similar requirements. For example, mowing the lawn and vacuuming could be performed by the same robot, as both require simply walking back and forth in a sequential lined pattern; this is important because robots are expensive and therefore you want to purchase as few as possible.
Next, you have to consider powering your slave. Personally I favour solar. My minions would be stored outside during daylight hours camouflaged as pot plants; less for aesthetic reasons as not wanting to draw unwanted attention; most robots are shy creatures.
Last of all, disciplinary action; what to do when your robot slave plays up. It's important to act quickly so as to prevent the bad behaviour being picked up by the others. Scolding is useless, and avoid lecturing as they actually enjoy it; as they do standing in the corner or time out. I've found what works best is getting them to watch those segments of Star Wars where Jedi are hacking limbs of robots; then walk around every morning with one of those cheap plastic light-sabres in your hand; robots don't know the difference and it will instil in them a healthy respect.