You will need an experienced attorney by your side for this case. Dependency cases are very different from anything you may have experienced previously, if at all.
Generally, the shelter hearing is an opportunity for the Judge to review the submitted hearsay evidence and review if it rises to the level necessary that shelter is necessary to protect the child(ren)'s health safety and welfare. It is a long process to vindicate yourself once the case has started. Again, do not handle this yourself. You need an attorney by your side.