Hygiene. If you have stored vegetables that are rotting, open containers of food in cupboards, or unsecured garbage pails, remove all refuse and replace containers with those that seal tightly. Check under appliances, in cupboards, basement corners, and other dark places for traces of a black gritty dirt that has an oily appearance. This is roach feces and a sign that you do have a problem.
Once your home is cleaned, your choices in removing them are to do it yourself, or to have the home professionally treated by a pest control company. Which you choose, may depend on the severity of the infestation.