OoT on speedrun.com: Leaderboards and links to help you getting started
Practicerom: Level up your practice
Streaming is currently not required. However a verification of your time can be requested by any moderator or entrant in the race. This is usually done by providing a local recording of your gameplay. If you fail to verify your time you will be disqualified from that race.
The rules for Bingo races can be found next to the bingo board that is linked as the race goal.
You can find the rules of RTA categories on speedrun.com on the leaderboard pages.