Recommendation for studying citizenship

I am a Haredi Jew. In the past, I have pondered the issue of conscription a lot and have built up various justifications for not enlisting. Following recent events, I am beginning to realize that my view of the whole issue was theoretical and detached, from the perspective of a private individual in an ideal situation – would it be better to invest time and energy in studying Torah or in defending the people? I am beginning to realize that I lack basic foundations in what is called "citizenship" and in understanding that if there is no army, we are all lost, and that if many evade, there will be no army (and in any case, there will be no moral obligation, etc.). I suppose that graduates of state education are taught these things like a glove, but what can I do – I did not study or was not educated about it. Can you recommend how to supplement information in this area? How to give myself a basic course (if possible – with all the "learners") in civics?