If you are concerned that the inquest will not investigate things in the way that you would like, it might be worth taking legal advice at some stage. Don't feel anxious about having to rush into this too fast - the inquest may be a long time coming.
We had support from the charity Inquest, and eventually instructed solicitors. The charity only deals with state-related deaths but their advice pages may help you to find more relevant support.
At the moment you are focused on a need to publicise the faults or wrongdoing that contributed to your son's death. The inquest will only try to discover what exactly happened and how and why it happens, rather than determining any criminal responsibility on anyone's part.
It may be that as time passes, that focus might start to align better with what you need, or it may be that you continue to be focussed on the need to publicise wrongdoing and achieve a sense of accountability. All I would emphasise is that right now your feelings are naturally going to be all over the place, and that thrashing blind ruminatory exhausting fury is naturally consuming you.
It is such early days, both in terms of grief and in terms of the inquest process. The feelings will rage on at their own pace but don't feel that you need instantly to translate them into practical action.
Just as an example of the different directions that grief can take, me and my husband took different paths. I guess that for him, the inquest was more about holding people to account and pursuing blame, whereas for me it was more about trying (and largely failing) to get some emotional comprehension of what had happened.
After the inquest, we had the opportunity to pursue legal action against the NHS. That wasn't what I needed, so I opted out. But DH did take legal action in just his name, and won a settlement. I think we both felt at peace with one another's different approaches and priorities.
