Recently, there has been growing interest among practitioners and scientists in teaching children computer programming languages. The international efforts to raise generations who produce technologies are supported at the national level in Turkey too. Programming language education is included beginning from secondary school curricula of computer science education. However, it can be mentioned that up-to-date methodological and pedagogical requirements of the courses are not adequately researched. Therefore, the primary aim of the study is to share innovative methods regarding programming education processes with middle school computer science teachers. This paper presents the details of a project conducted to design an in-service training model for computer science teachers and funded by the Scientific and Technological Research Council of Turkey (TUBITAK) with the project number of 116B298. During the training period, up-to-date methodology and technologies were presented in workshops with an integrated approach. At the end of the courses, the participants' development and the efficiency of the activities were investigated based on the analyses of qualitative and quantitative data and positive results about the content of proposed in-service teacher training methodology were yielded.