Start with the basics. Epics → Feature or maybe Component → Feature → Subfeature?
Add Assignees, State, rich-text Description, etc. Add more custom Fields as you go.
Сhoose from the pre-built RICE, Value/Effect score, and MoSCoW frameworks, or create your own.
Timeline, Board, Calendar, or all of them? Look at the data from multiple angles.
Collaborate in the Internal Roadmap with the team, and share the Public one with stakeholders and customers.