Now, you need to remove the food supply and water supply. Do a thorough cleaning in your kitchen and use a de-greaser to get all of the surfaces clean. Fix any dripping faucets or other leaks. Put food into plastic containers or zipper lock bags and remove empty food and beverage cans from your home immediately.
Once you have sealed and cleaned, lay down some roach traps along the walls in areas where you suspect roaches. Monitor the traps daily. This will allow you determine where they are coming from and what type of roaches you are dealing with.