Here you go....ready? This is what I did when I saw just one and only one cockroach in my house...
Empty everything out of your cupboards....every cupboard. high and low.
Throw out everything not 100% sealed, all cereals and chip bags, everything.
Clean all bottles and cans with a minimal bleach solution.
Clean all cupboard shelves and door with a minimal bleach solution.
Pull your fridge out from against the wall and clean under it...all of it. Clean the back of your fridge as well.
Inspect every single appliance particularly the toaster and microwave. Roaches love grease (oh by the way, they love earhair, nosehair, and eyebrow hair also...that should give you more of an incentive to disinfect everything.) so make sure the filter in your micro is clean and the underside of the micro as well. THe toast particles in your toaster and even the underside of your blender.
Once everything is clean and the non-sealed items are discarded. Then you can restock the shelves.
Now, You must obliterate all sign of them....they hide in cracks. So, you have to get a vacuum. Not a stand up push/pull vacuum, but a tank vacuum, wet-dry... Strong suction.
Take the bleach solution and test to make sure that it wont stain your floor in some obscure little area. With a small brush, go around all the base boards and edges with the solution following right behind with the vacuum. When all the edges are done, disinfect the rest of the floor
Once everything is clean and disinfected, then and only then would I suggest stuff like boric acid. It may kill the roaches that come into contact with it, but if they are in your box of cheerios laying their little eggs and "breeding" then there really is no need.
Call me obsessive compulsive on this if you would like. I hate bugs and will not screw around with roaches particularly. After you have done all that you can do from a hygenic standpoint....bring in a pest controller and have them spray inside and out.
Take all boxed or bagged food that your family eats and put it in sealable containers, no not the cheap stuff, the "in your face roaches" stuff.
That may well do the trick. It did for me.