Your first hearing will be brief. You will be called from a duty list (there will be many matters to be heard that day) when the judge is ready to hear your matter.
It is an interim hearing, which means no evidence will be tested (no cross-examination), but the judge will likely ask some basic questions about the circumstances, such as what the child's care arrangements were until that point.
If the other party has not filed a response, it's likely the matter will be adjourned, but the judge may still impose some interim orders to enable the child to spend time with the applicant while proceedings are afoot.
The judge might also make some orders about the parents attending a post-separation parenting course and another family dispute resolution conference.
Overall though, the process for interim hearings is quite swift and simple. Listen, don't interrupt the judge, answer questions as clearly as you can. If you're self-representing, it helps to get used to using the phrases "the child's best interests" and "the child's rights" (as opposed to "I want" and "my rights"). Some judges like people to understand what they're there for - their child's interests, not their own.