You can either do three Modules of the Delft Method or the complete course A1A2. With both options you learn enough language to pass the Civic Integration Exam on Level A2. The duration of each option is 15 weeks.
After that, read on Nt2 dossier KNM how to prepare KNM. On NT2 dossier ONA you’ll find what to do to prepare ONA. However, when you have been working in the Netherlands, you are exempt of ONA.